Fix (I hope) setuid problems introduced in 8.2 that caused
messages like "Cannot create qfXXXXXX: Invalid argument"
or "Cannot reopen dfXXXXXX: Permission denied". This
involved a new compile flag "HASSETEUID" that takes
the place of the old _POSIX_SAVED_IDS -- it turns out
that the POSIX interface is broken enough to break
some systems badly. This includes some fixes for
HP-UX. Also fixes problems where the real uid is
not reset properly on startup (from Neil Rickert).
Fix a problem that caused timed out messages to not report the
addresses that timed out. Error messages are also more
Drop required bandwidth on connections from 64 bytes/sec to
Further Solaris portability changes -- doesn't require the BSD
compatibility library. This also adds a new
"HASGETDTABLESIZE" compile flag which can be used if
you want to use getdtablesize(2) instead of sysconf(2).
These are loosely based on changes from David Meyer at
University of Oregon. This now seems to work, at least
Fix a problem that can cause duplicate error messages to be
sent if you are in SMTP, you send to multiple addresses,
and at least one of those addresses is good and points
to an account that has a .forward file (whew!).
Fix a problem causing messages to be discarded if checkcompat()
returned EX_TEMPFAIL (because it didn't properly mark
the "to" address). Problem noted by John Myers.
Fix dfopen to return NULL if the open failed; I was depending
on fdopen(-1) returning NULL, which isn't the case. This
isn't serious, but does result in wierd error diagnoses.
CONFIG: add UUCP_MAX_SIZE M4 macro to set the maximum size of
messages sent through UUCP-family mailers. Suggested
by Bill Wisner of The Well.
CONFIG: if both MAILER(uucp) and MAILER(smtp) are specified,
include a "uucp-dom" mailer that uses domain-style
addressing. Suggested by Bill Wisner.
CONFIG: Add LOCAL_SHELL_FLAGS and LOCAL_SHELL_ARGS to match
LOCAL_MAILER_FLAGS and LOCAL_MAILER_ARGS. Suggested by
CONFIG: Add OSTYPE(aix3). From Christophe Wolfhugel.
Don't drop out on config file parse errors in -bt mode.
On older configuration files, assume option "l" (use Errors-To
header) for back compatibility. NOTE: this DOES NOT
imply an endorsement of the Errors-To: header in any way.
Accept -x flag on AIX-3 as well as OSF/1. Why, why, why???
Don't log errors on EHLO -- it isn't a "real" error for an old
SMTP server to give an error on this command, and
logging it in the transcript can be confusing. Fix
IRIX compatibility changes provided by Dan Rich
<drich@sandman.lerc.nasa.gov>.
Solaris 2 compatibility changes. Provided by Bob Cunningham
<bob@kahala.soest.hawaii.edu>, John Oleynick
<juo@klinzhai.rutgers.edu>
Debugging: -d17 was overloaded (hostsignature and usersmtp.c);
move usersmtp (smtpinit and smtpmailfrom) to -d18 to
match the other flags in that file.
Flush transcript before fork in mailfile(). From Eric Wassenaar.
Save h_errno in mci struct and improve error message display.
Changes from Eric Wassenaar.
Open /dev/null for the transcript if the create of the xf file
failed; this avoids at least one possible null pointer
reference in very wierd cases. From Eric Wassenaar.
Clean up statistics gathering; it was over-reporting because of
forks. From Eric Wassenaar.
Fix problem that causes old Return-Path: line to override new
Return-Path: line (conf.c needs H_FORCE to avoid
re-using old value). From Motonori Nakamura.
Fix broken -m flag in K definition -- even if -m (match only)
was specified, it would still replace the key with the
value. Noted by Rick McCarty of Texas Instruments.
If the name server timed out over several days, no "timed out"
message would ever be sent back. The timeout code
has been moved from markfailure() to dropenvelope()
so that all such failures should be diagnosted. Pointed
out by Christophe Wolfhugel and others.
Relax safefile() constraints: directories in an include or
forward path must be readable by self if the controlling
user owns the entry, readable by all otherwise (e.g.,
when reading your .forward file, you have to own and
have X permssion in it; everyone needs X permission in
the root and directories leading up to your home);
include files must be readable by anyone, but need not
If _POSIX_SAVED_IDS is defined, setuid to the owner before
reading a .forward file; this gets around some problems
on NFS mounts if root permission is not exported and
the user's home directory isn't x'able.
Additional NeXT portability enhancements from Axel Zinser.
Additional HP-UX portability enhancements from Brian Bullen.
Add a timeout around SMTP message writes; this assumes you can
get throughput of at least 64 bytes/second. Note that
this does not impact the "datafinal" default, which
is separate; this is just intended to work around
network clogs that will occur before the final dot
is sent. From Eric Wassenaar.
Change map code to set the "include null" flag adaptively --
it initially tries both, but if it finds anything
matching without a null it never tries again with a
null and vice versa. If -N is specified, it never
tries without the null and creates new maps with a
null byte. If -O is specified, it never tries with
the null (for efficiency). If -N and -O are specified,
you get -NO (get it?) lookup at all, so this would
be a bad idea. If you don't specify either -N or -O,
Fix recognition of "same from address" so that MH submissions
will insert the appropriate full name information;
this used to work and got broken somewhere along the
Some changes to eliminate some unnecessary SYSERRs in the
log. For example, if you lost a connection, don't
bother reporting that fact on the connection you lost.
Add some "extended debugging" flags to try to track down
why we get occassional problems with file descriptor
one being closed when execing a mailer; it seems to
only happen when there has been another error in the
same transaction. This requires XDEBUG, defined
Add "-X filename" command line flag, which logs both sides of
all SMTP transactions. This is intended ONLY for
debugging bad implementations of other mailers; start
it up, send a message from a mailer that is failing,
and then kill it off and examine the indicated log.
This output is not intended to be particularly human
readable. This also adds the HASSETVBUF compile
flag, defaulted on if your compiler defines __STDC__.
CONFIG: change SMART_HOST to override an SMTP mailer. If you
have a local net that should get direct connects, you
will need to use LOCAL_NET_CONFIG to catch these hosts.
See cf/README for an example.
CONFIG: add LOCAL_MAILER_ARGS (default: `mail -d $u') to handle
sites that don't use the -d flag.
CONFIG: hide recipient addresses as well as sender addresses
behind $M if FEATURE(allmasquerade) is specified; this
has been requested by several people, but can break
local aliases. For example, if you mail to "localalias"
this will be rewritten as "localalias@masqueradehost";
although initial delivery will work, replies will be
broken. Use it sparingly.
CONFIG: add FEATURE(domaintable). This maps unqualified domains
to qualified domains in headers. I believe this is
largely equivalent to the IDA feature of the same name.
CONFIG: use $U as UUCP name instead of $k. This permits you
to override the "system name" as your UUCP name --
in particular, to use domain-ized UUCP names. From
CONFIG: create new mailer "esmtp" that always tries EHLO
first. This is currently unused in the config files,
but could be used in a mailertable entry.
Serious security bug fix: it was possible to read any file on
the system, regardless of ownership and permissions.
If a subroutine returns a fully qualified address, return it
immediately instead of feeding it back into rewriting.
This fixes a problem with mailertable lookups.
CONFIG: fix some M4 frotz (concat => CONCAT)
Serious bug fix: pattern matching backup algorithm stepped by
two tokens in classes instead of one. Found by Claus
Assmann at University of Kiel, Germany.
Another mailertable fix....
4.4BSD freeze. No semantic changes.
Fix some lintish problems.
Fix some cases where server SMTP behaved poorly when handed bogus
input, pointed out by Eric Wassenaar.
CONFIG: fix some more (sigh) mailertable bugs -- thanks to
Motonori Nakamura of Kyoto University (again).
Don't send 050 (-v) information after the 250 response to a QUIT
command in srvrsmtp -- clients usually close the connection
at this point, and it causes bogus error messages.
Don't send messages that have errors on input (such as unbalanced
parentheses) during SMTP transactions, since a return
message has (probably) already been sent.
Give better diagnostics on timeouts during network reads, including
information similar to the SMTP phase.
Fix bug that caused SMTP messages to deliver synchronously; this
happened after the DATA 250, and hence caused reading the
next command to be delayed.
Ignore Errors-To: header unless 'l' (lower case el) header is
specified. The Errors-To: header violates RFC 1123.
Errors-To: was only needed to take the place of the
envelope sender in the days when most Unix mailers
didn't understand about the two kinds of senders.
Don't send warning messages in response to automatically generated
messages (that is, those From:<>).
CONFIG: fix some rather stupid typos in the mailertable code
pointed out by Motonori Nakamura of Kyoto University.
CONFIG: add confUSE_ERRORS_TO configuration option.
CONFIG: if ALWAYS_ADD_DOMAIN is selected, try to use $M
(masquerade name) instead of $j.
CONFIG: don't add dots to relay names (added in 6.29); it breaks
several things, and can be simulated by dot terminating
the names of relays. For example, use:
Fix prototypes to eliminate chars in argument lists -- some
compilers are pissy about this.
Log protocol ($r) and body type if set so we can determine if
the adaptive algorithms are working.
Pessimize on locking of database files (particularly for NEWDB
databases) during opens. There were problems with
processes opening the file while it was rebuilt; since
NEWDB caches heavily, the reader opened an empty file,
which is an error. If your system has the ability to
lock atomically on open, this works properly; otherwise,
there are race conditions.
Check mod time on .pag file instead of .dir in NDBM aliases
because the .dir file doesn't get updated for small
alias files. From John Gardiner Myers of CMU.
More Solaris portability -- it now compiles on Solaris, but
hangs up in gethostbyname().
Move setting of RES_DEBUG flag before first myhostname() call
so we can see name server traffic on that call.
Fix a problem that causes -bi to try to rebuild maps other than
Fix a problem that caused udb to reject entries from any but
the first database listed.
Rearrange doc subdirectory for 4.4BSD release tape.
CONFIG: put $r into the Received line. This was an oversight.
CONFIG: fix typo (call to ruleset 99 should have been rulset 90).
CONFIG: move "auxiliary" subroutines to be in ruleset 90-99
range -- in the long run, single digit rulesets may
become reserved for builtin use by sendmail.
CONFIG: fix major problem that causes host aliases (that is,
anything in $=w != $j) to not be recognized. This has
Fix recursive syserr (if there is an error printing a syserr
message). This makes the code much less eager to consider
a write error as serious. This also includes some
heuristics to be clever about closed connections.
Lock NEWDB files during gets. This requires version 1.5 or later
of the db library. If you have an older version, you
can use -DOLD_NEWDB. This will go away in a few weeks.
Fix problem causing aliases that use host maps to get overwritten.
Do appropriate byte swapping on port numbers in ident protocol
code. Fix from Allan Johannesen of WPI.
Defer opening of map files to the same time as alias files so that
the daemon will tend to pick up new versions more promptly.
Prototype a bunch more functions.
Some Solaris 2.1 changes (still doesn't link though).
Try to simplify Makefiles by including more subordinate #defines
in conf.h (based on OS type).
CONFIG: check for domains if FEATURE(mailertable) is defined.
For example, if the host name is "knecht.cs.berkeley.edu"
it will search the following mailertable keys:
This could be used to replace the special relays for bitnet
Fix problem that prevented appending dots on canonified host
names. This breaks tons of config files -- very
Fix improper pointer dereference in response to HELO command.
Fix core dump if debugging set in map_rewrite.
CONFIG: add FEATURE(always_add_domain) to always attach the
local domain (only impacts local mail).
CONFIG: try to avoid turning names into $j -- although
technically a host can only have one "canonical name",
it seems to be common practice to have several.
Major change: merge alias databases with maps. This expands and
changes the map class interface but fixes a bunch of bugs.
The important user-visible change is that the file name
in a K line now does not include the ".db" extension; this
is added automatically. Also, the -d (NIS domain) flag is
missing from the K config line; use @domain instead.
When compiling, the *_MAP names are gone -- just compile
in NDBM, NEWDB, and/or NIS support.
Announce mailer/host/user triple on -bv flag -- from Brian
Bullen of Stirling University.
Don't send more than one line in response to HELO -- it confuses
Pony Express, which then behaves very badly. However,
this change does send two line 220 greetings, with the
second line reading "ESMTP spoken here". The usersmtp
module recognizes this and goes into ESMTP mode regardless
of the setting of the "a" mailer flag. Thus, "a" means
AIX portability changes (thanks to Christophe Wolfhugel of
Herve Schauer Consultants (Paris) for providing me with
an INSA account for this purpose). Lightly tested. Use
-D_AIX3. This probably breaks compatibility with some
older systems (e.g., 4.2bsd) but still works on SunOS
4.1.2, Ultrix 4.2A, HP-UX 8.07, OSF/1 T1.3, and AIX 3.2.3.
Fix a problem causing an error message loop if the output channel
Add the Makefiles that I use for various environments -- some are
Berkeley make versions and some are old make versions.
My makefile for the NeXT box has gotten lost, alas!
PRALIASES: support for printing NEWDB databases. From
Michael J. Corrigan of U.C. San Diego.
CONFIG: don't pass pseudo-domains to $[ ... $] (if you have
a wildcard MX it can have wierd results). From
CONFIG: dot terminate relay hostnames in S0. From Christophe
Log version with SMTP daemon startup message.
Adjust setproctitle to work on NetBSD and BSD/386.
Fix null pointer reference in MX fallback code.
A bunch of minor fixes from Eric Wassenaar:
If deliver cannot execv the mailer, return EX_OSERR
instead of EX_TEMPFAIL (to give better
Consistently malloc e_message.
Catch degenerate case of calling returntosender()
Fix bug that can cause incorrect verbose display of user smtp
Disable SMTP VERB command if PRIV_NOEXPN is set (since this
could reveal the same information.
Allow failure when reading SMTP greeting message to go on to
Add "MIME-Version: 1.0" header if using MIME (this was NOT
included in RFC 1344, but Bill King of Allan-Bradley
Company forwarded me email from Nathaniel Borenstein
claiming that it was an inadvertent omission).
Don't use Content-Type: X-message-header. According to John
Myers of CMU, many MIME readers will completely ignore
the data if they don't recognize it. Instead, just
add a blank line to make it a legal (empty) message.
Fix problem causing dots to keep getting appended to cached
hostnames. This can cause buffer overrun conditions.
The problem was found by Erik Forsberg of Retix,
although I used a different bug fix than he provided.
Fix parsing of split header/envelope rewriting specs -- from
Fix from Eric Wassenaar to correct To: lists in error messages.
Fix minor glitch causing extra ctladdrs to be output to queue
Cache results of name server canonification lookups to avoid
Major rewrite of alias.c: considerable cleanup, plus sample
(untested) support for NIS aliases. The "A" option
can now be a comma separated list (or be repeated) --
that is, you can have multiple alias databases. Each
database can have the syntax ``class:file''; if no class
is specified, the "implicit" class is assumed. Implicit
searches through a list of compiled in types -- hash,
dbm, nis, and stab. Alias files are searched in the
order they are listed. For example:
OAhash:/etc/aliases.local,/etc/aliases
OAnis:mail.aliases@my.nis.domain
first searches the hash database /etc/aliases.local,
then the regular /etc/aliases database, then the NIS
map "mail.aliases" in the NIS domain "my.nis.domain".
If in Verbose mode (probably from VERB command) run SMTP job
in foreground and don't do RCPT optimizations.
Add udb :mailsender as equivalent to owner- for regular aliases.
Delete option 8; add option 7 that means the opposite. That is,
default to 8-bit mode; a special option is needed to
force sendmail into 7 bit mode.
Send error messages in encapsulated MIME format.
New compile flag "NIS" that turns on NIS alias and NIS map
Add "j" option to send error messages in MIME (RFC 1341)
encapsulated message format per RFC 1344. The
syntax is pretty ugly if you don't have MIME-aware
Clean up message handling (for display in mailq output).
New setproctitle implementation for 4.4bsd.
Create files (such as ~/dead.letter) using mode FileMode (the
F option value) instead of 0666.
Fix bug causing output of EXPN command to not be fully qualified.
This may cause some problems with UUCP addresses that
will require some config file assistance -- specifically,
the $: part has to include the host name for this output
Fix a problem that sometimes diagnosed errors and still sent the
message if the header syntax was bad.
Fix a bug that caused an error message to be emailed when sendmail
was operating in -bv mode.
Add "ListenQueueSize" keyword to daemon options option (OO) to
set the queue size parameter passed to listen(). You
will normally have to tweak your kernel to up this.
Strip spaces off of beginning of message-id before logging (in
case it was folded across lines).
Tweak compile flags in daemon.c -- there were some cases where
it wouldn't work without NETINET.
Change *file* mailer to output all the usual default headers
(From, Date, Message-Id). It gets used when sending
CONFIG: explicitly catch and diagnose list:; syntax in ruleset
zero -- this is not a valid recipient syntax according
CONFIG: add confMIME_FORMAT_ERRORS to send error messages in
MIME format. Defaults to on.
CONFIG: add SMTP_MAILER_FLAGS and UUCP_MAILER_FLAGS to augment
the flags for those mailers.
Fix problem that causes the fallback mail to postmaster
(case ESM_POSTMASTER in savemail()) to not look at
Some more HPUX tweaking (compile flag hpux => __hpux so it
still works in ANSI mode).
Don't try to flock non-regular files when mailing to a file.
In particular, this was a problem if you tried to
Fix a wierd bug that can cause senders to be queued as
recipients if the name server is down when the mail
is initially sent. This hack just ignores sender
deletion (essentially, it sets the MeToo flag) if there
is a TEMPFAIL during processing of the sender address.
Fix a dangling else problem -- from Brian Bullen from University
Add the "b" mailer flag to force a blank line on the end of
messages. Some brilliant versions of /bin/mail insist
on this but do not add it themselves.
Add the "g" mailer flag to prevent user SMTP from sending
"MAIL From:<>". This is only intended to be a
transitional gesture, and should not be used if at
all possible. It appears that Berkeley and IDA
config files have always handled this properly; the
UK config kit apparently does not.
Don't lowercase and then capitalize header field names -- leave
them with original capitalization. Fixes from Bill
King of Allen-Bradley Company.
Further cleanup and improved reporting of error messages,
particularly conditions that cause messages to be
requeued for future delivery.
Tweak syslog priorities in some cases.
CONFIG: clean up route-addr on UUCP addresses.
HPUX 8.07 compatibility changes in getla() -- I had to make
these changes to get it to work at Berkeley, although
others seem to have been working before (???).
Various patches to XLA code.
Fix problem that causes setuid bit on files to be ignored from
SMTP or in queue runs. Problem noted by Jason Ornstein
Fix problem that can cause CNAMEs to be ignored.
Generalize getmxrr to match local host in $=w instead of a
Some cleanup from Eric Wassenaar:
Use FileMailer instead of ProgMailer in two places.
Eliminate duplicate 8th-bit stripping in commaize.
Fix a problem with mis-parsing of backslash escapes
under some circumstances.
NIS map fix (was always including trailing null character)
from Mike Glendinning of Ingres UK.
Add "a" mailer flag to try using ESMTP. It tries the EHLO
command and if that fails falls back to regular SMTP.
Also parses EHLO option keywords. If host supports
SIZE extension, this is added to the MAIL FROM:
Extend "b" option to include a second value which is the
maximum message size this server is willing to accept.
For example, a value of "10/1000000" says that there
must be ten blocks free, and sendmail will reject
any message larger than one megabyte.
Some portability hooks for NeXT (this could be applicable
to Mach in general). You have to create an empty
file called "unistd.h" to get it to compile.
Adjust config values (MAXLINE, MAXATOM, and PSBUFSIZE) to
Add X400-Received: to the list of headers tagged with H_TRACE
in conf.c. From Bill King, Allen-Bradley Co.
Fix problem that caused redefinition of SMTP and QUEUE compile
flags. Pointed out by Jon Forrest of the Sequoia 2000
Properly handle \! hack -- it was treating host\!user as one
token (host!user) instead of three (host, !, user).
Fix from Eric Wassenaar of NIKHEF-H.
Fix compilation problem in getauthinfo() if IDENTPROTO is off.
Turn off DEFNAMES and DNSRCH when getting the hostsignature
(i.e., MX records) in level 1 configuration files; this
matches the old behaviour. From Nakamura Motonori of
Improve error message printing -- if sent through an alias,
error messages include the name of the alias in the
message. Unfortunately, in order to make this work
properly in queue runs, this changes the format of the
C line in the qf file. The relatively uselessness of
the previous information was pointed out to me by
Allan E Johannesen of WPI.
Add XLA compile flag to add hooks to Christophe Wolfhugel's
extended load average code. This is still in very early
form. For information regarding the guts of the xla
code, contact Christophe.Wolfhugel@grasp.insa-lyon.fr.
Additional hooks for detecting tempfails in rewriting rules
(that is, in map lookups).
Properly diagnose ruleset zero returning null (instead of a mailer
triple). From Nakamura Motonori of Kyoto University.
More generalization of socket code for other protocols.
Shorten timeouts on reverse name lookups -- since they are done
during connection establishment, long timeouts here can
cause higher level timeouts. This mainly serves to accept
mail from hosts that do not have proper reverse (PTR) DNS
Reset e_statmsg before each mailer invocation to avoid bogus
Redefine $r, $s, and $_ in error envelopes so you don't get
incorrect cruft in the error message. Problem noted by
Nakamura Motonori of Kyoto University.
Fix a problem that can cause failure to return errors to Postmaster
in certain cases. From Nakamura Motonori.
Fix a problem that can cause some systems to give duplicate error
messages when a bad syntax address such as "<a" is presented
to an SMTP server. It doesn't seem to occur on all
machines. From Nakamura Motonori.
Default IDENTPROTO off for Ultrix and HPUX, which apparently have
the interesting "feature" that when they receive a "Host
unreachable" message they closes all open connections to
that host. However, some firewall gateways send this message
if you try to connect to an unauthorized port, such as the
IDENT port (113). Thus, no email can be received from such
hosts. There is some evidence that versions of Ultrix before
4.3 do not have this problem. Thanks to Tom Ivar Helbekkmo
for pointing out this behaviour to me and to Michael Corrigan
of U.C. San Diego for informing me about the HPUX problem.
Allow IPC mailers to return a colon-separated list of hosts in the
$@ clause; these are searched in order as though they were
When sending an error report, print the list of addresses tagged
as bad. Requested by Allan E Johannesen of WPI.
Change map function calls to return a status code. This gets
passed back as the result of rewrite. Parseaddr marks
the address as a QUEUEUP address if the return code is
EX_TEMPFAIL. All this to queue properly if the name
server is down. This code is not well tested. This code
changes the interface to map lookup functions (a fifth
parameter, int *statp, is added). Feature requested by
Don't delete quotes (in the dequote map) if there are spaces in
the string, since this would cause them to be replaced by
Accept BODY=8BITMIME on SMTP MAIL command. This isn't advertised
because the 8BIT to 7BIT translation doesn't exist yet.
This does add a "bodytype" field to both envelope and
queue file and a -B command line flag to pass the type in
during direct invocations.
Discard return error messages only on responses to responses to
responses, not on responses to responses. That is, the
algorithm is to try return to sender, then return to
postmaster, then discard. Previously it discarded
immediately if the return to sender pass failed.
CONFIG: back out change to hide unqualified hostnames behind %-hack.
This screws up local aliases and .forward files.
CONFIG: add FEATURE(nocanonify) to turn off calls to $[ ... $];
some sites only handle completely canonified names.
Requested by John Gardiner Myers of CMU.
CONFIG: some UUCP code was still included even if FEATURE(nouucp)
Clean up some minor glitches on error return messages pointed out
by Nakamura Motonori of Kyoto University.
Fix reply() to not reset SmtpReplyBuffer on fatal errors; this
was supposed to reset SmtpMsg Buffer. This makes the
client side code virtually useless. Reported by Allan
E Johannesen of WPI and Phil Brandenberger of Swarthmore.
Better debug messages if fuzzy is disabled, suggested by Allan
Offset SmtpReplyBuffer by four in usersmtp when checking for
loopback. From Eric Wassenaar.
Don't set $s until after runinchild in srvrsmtp -- otherwise
it gets cleared. From Eric Wassenaar.
Implement IDA-style $&x for deferred macro expansion.
More POSIX compatibility.
CONFIG: Hide unqualified hostnames behind %-hack using $s as the
actual sender. This is only done if $r is non-null, that
is, if this is not locally submitted mail.
CONFIG: Add FEATURE(bitdomain) allowing mapping of BITNET host
names to internet domains. A program contributed by
John Gardiner Myers of CMU to create the maps is included
in the contrib directory (in the "misc" tar file).
CONFIG: Add FEATURE(uucpdomain) for a similar mapping for UUCP
hosts. There is currently no tool to create this map.
Add D= mailer flag to specify a path of possible working directories
in which to execute the mailer. This is intended for the
prog mailer; some shells can get upset if they don't have
access to the current directory.
Add RFC 1413 (IDENT) protocol support. This is only very loosely
tested. This adds a $_ macro to be the authenticated
info (in ``user@domain [address]'' form) and debug flag
Check for loopbacks in usersmtp instead of srvrsmtp -- there is no
reason for a local agent to not be talking to the localhost
(although the inverse is not true).
Add a few hooks for automated map rebuilding. This is certainly
CONFIG: Have prog mailer specify a path of ``D=$z:/'' -- that is,
user's home directory then the root.
CONFIG: Log RFC 1413 identification in Received: line.
Fixes to requeueing code to make it compute priority, nrcpts,
Diagnose incorrect privacy flags. Suggested by Bryan Costales
Arrange to quote backslashes as well as other special characters
in the phrase part of a route-addr.
Some fixes to FallBackMX code suggested by Nakamura Motonori of
More vigorous zeroing of CurHostAddr to avoid logging of bogus
host addresses when you are actually just printing
information from the MCI structure; problem noted by
Michael Corrigan of U.C. San Diego.
Don't ignore rest of queue if any job is not runnable. This can
also cause an incorrect job to be lost. Fix from
Always respond "quickly" to RCPT command; do alias expansion and
the like later. This also means that mail for lists that
have errors will be acccepted, and an error sent back
later. This is done by instantiating the queue file
and then immediately running and requeueing it.
Fix incorrect diagnosis of infinite loop in ruleset. Problem noted
Improve information printed when infinite loops are discovered.
Zero CurHostAddr to fix erroneous internet addresses in log when no
addresses can be bound. Pointed out by Nakamura Motonori
"Probe" SMTP connections using RSET instead of NOOP "just in case".
Suggested by John Gardiner Myers of CMU.
Don't warn about -f if you are setting sender to yourself.
Fix incompatible call to endmailer in smtpquit which causes core
dumps. Noted by Allan E Johannesen of WPI.
HPUX portability changes from Michael J. Corrigan of UC San Diego.
Require MAIL before RCPT command in srvrsmtp.c. This had been
intentional from the 821 draft days when the order wasn't
Fix bug in nis_magic routine that was initializing parameters
incorrectly. Fix from Takahiro Kanbe of Fuji Xerox
Information Systems Co., Ltd.
Change default for PrivacyFlags in conf.c to 0 -- since it always
"or"s in new values, there was no way to turn off the
Add O option to set SMTP daemon options.
Add V option to set fallback MX host. This always sorts at lower
priority than anything it gets from the name server. It
should only be used for environments with very bad network
connectivity. Requested by several people.
Log sending info. It's not clear this is a good idea.
CONFIG: fix typo in mailertable code. Noted by Phil Brandenberger
CONFIG: add confDAEMON_OPTIONS and confFALLBACK_MX to set options
Fix botch in server SMTP that broke transactions that did not
use HELO first (like MH). Fix from Michael Corrigan
Fall back to other MX records if there is an error anywhere
in delivery (actually on MAIL or DATA -- RCPT is harder).
Suggested by John Gardiner Myers and Nakamura Motonori.
Revert to non-prototypes -- it turns out that our ANSI C
compiler is more forgiving than most others about
mixing prototyped extern declarations with non-prototyped
Fix a problem with multi-word class matching pointed out by
R$+ $=X $+ $: $1 < $2 > $3
the input "user@a.b.c" failed instead of being properly
rewritten as "user@a.<b>.c".
Neil also convinced me that it was correct that $~ should match
only one token -- the problem is that it's always possible
to add another token, so $~ matches far too eagerly.
Implement multi-word classes (properly!).
Add X-Authentication-Warning: headers to clue users into possible
attempts to forge mail. This is on the authwarnings
privacy flag, but is the default. Suggested by Bryan
Pass default units for convtime in so they can be more reasonable.
Allow config files to always add a new Comments: header (i.e.,
they will be added even if an old one already exists).
Suggested by Bryan Costales of ICSI.
Allow config files to delete an existing Return-Path: header.
These should only be added at final delivery. Suggested
by Bryan Costales of ICSI.
Some debugging additions. Suggested by Bryan Costales of ICSI.
Clean up logging of Family 0 addresses. Noted by David Muir
Add a "dequote" map class. This allows config files to strip
quotes off of addresses. Note that this is not a builtin
map, just a class -- so you have to define the map
Fix a bug in the queueup() loop getting a locked tf where in
very odd cases it can fall off the bottom and core dump.
Of course, it was P{r Emanuelsson who found it....
Open a new transcript when splitting an envelope. Problem found
by Allan E Johannesen of WPI.
Improved error output in endmailer if the mailer core dumps.
CONFIG: Fix typo in UUCP mailer definition.
CONFIG: Default several of the new options on: eight bit input,
privacy flags set to "authwarnings", and message warning
Fix problem with assumption of an sa_len field in a generic
sockaddr -- it turns out that most vendors haven't
picked up this (very important) fix.
Change compilation flags for daemon code -- select one or both
of NETINET or NETISO, but don't ever set DAEMON manually.
CONFIG: add FEATURE(mailertable) to do IDA-style mailertables.
Use Postmaster as default fallback return address, not root.
POSIX changes for file descriptor handling.
Diagnose errors writing new queue file.
If you change the owner using an owner- alias, also change the
error mode to EM_MAIL so that errors don't get dropped
into an inappropriate directory. Problem noted by
Allan E Johannesen of WPI.
If you are su'ed to root, send email as who you really are, not
as root. From Brian Kantor of U.C. San Diego.
Allow warning messages to be sent after a configurable interval
has passed without delivery. The message is sent only
once per envelope. This changes the format of the qf
file to have an F line, and the format of the T option
to accept take the format "return/warn" (both intervals).
Don't force all local names to lower case -- this was left over
from the wierd handling of case mapping on aliases. It
is now driven (as expected) by the "u" mailer flag.
Problem noted by P{r Emanuelsson.
Fix problem that caused headers on returned email to be trashed;
they were getting freed, but are still accessible via
Fix problem that caused bogus ids to be created on returned
Add support for ISO and other non-INET networking. This is by
no means finished yet. This does assume a lot of other
system support, like a version of gethostbyname that
returns non-AF_INET addresses.
CONFIG: change default on prog mailer to keep upper case in
user names (i.e., in the program command line).
CONFIG: strip trailing dots off of hosts in uucp mailer before
CONFIG: create new "relay" mailer for $R (LOCAL_RELAY) and $H
(MAIL_HUB) delivery that doesn't add local domain. Note
that this violates 821, but is probably "more correct"
for what we are trying to do. Problem pointed out by
Michael Graff of Iowa State.
Clean up unnecessary creates of queue ids (i.e., empty qf files)
when not needed, such as when starting up an SMTP
Fix problem where split envelopes aren't instantiated in the queue.
This is quite a serious bug.
Owner- aliases had problems with leading spaces causing a
Have ending 250 (after DATA) include the id; suggested by
Brian Kantor of UC San Diego.
Add logging on envelope splitting.
Change queue ids to have one more letter encoding the hour of
the day so that during a single day there is a greater
likelihood of uniqueness; requested by Brian Kantor.
Fix minor compile problem if LOCKF is defined.
Define size of tobuf in conf.h. Observed by Toshinari Takahashi
Restore e_sender -- this is equivalent to e_from.q_paddr without
decorations such as angle brackets and comments.
OSF/1 on Alpha changes from Allan E Johannesen of WPI.
CONFIG: fix typo in S3 for list syntax (;: => :;). Thanks to
Christopher Hoover for noting the problem.
Pass envelope to disconnect to avoid another use of CurEnv, which
can apparently end up being null at inopportune times.
Log "received from" as "relay=" for consistency (suggested by
Fix major bug in header handling: if no From: line existed in
the header (so sendmail inserts one), and the sender is
an alias that has an owner, the From: line shows the
owner (as well as the envelope). Fixed by early binding
the headers (which will change debugging output).
HPUX portability patches from Michael J. Corrigan of UC San Diego.
Some attempts to adapt better to out of open file conditions.
Some changes to ctladdr handling in queue files.
MAJOR CHANGE: delete e_sender and e_returnpath (why are these
different from e_from?) and $< macro.
Log correct IP address in relay= field even if the connection
Log "received from [RESPONSE]" on EF_RESPONSE messages (from
Fixes to SysExMsg logging (sometimes just got "message: %s"
instead of "message: error message"), noted by Eric
Wassenaar. Also reported by Nakamura Motonori.
Improvements to MX piggybacking code, from Nakamura Motonori.
Fix case where CurHostName points to an auto variable that has
been deallocated (from Nakamura Motonori).
Fix bug causing newlines to be included in aliases if option
"n" (check alias RHS) is set; bug noted by David Muir
Fix problem causing user names that should be mapped to lower
case to not be mapped if they are sent during a queue
run. This greatly simplifies the case mapping code.
Problem noted by Allan E Johannesen of WPI.
Don't do recipient address rewriting in buildaddr. This
improperly did recipient rewriting on sender addresses,
and just seems bogus in general -- but the change could
Pass TZ envariable to child processes for System V.
CONFIG: allow LOCAL_RULE_1 and LOCAL_RULE_2 if you want to
KNOWN PROBLEM: I have seen some problems on SunOS that causes
the User Data Base to give errors on some addresses. I
have tracked the problem back at least as far as 93.02.15
(version 6.22). Running with debugging on makes it
go away, so I conclude that it is referencing uninitialized
stack data. I haven't been able to track this down yet.
Allow local mailer to specify $@host -- this lets you assign the
"foo" part of jgm+foo to $h for passing in to the local
Additional debug printing in getcanonname (show query type).
Don't add the e_fromdomain on sender addresses -- this interacts
wierdly with the owner- code.
Improve delivery logging to not log obvious or meaningless stuff.
Include numeric IP address in Received: lines per RFC 1123 section
Fixed a bug in checking stat() return value if restrictmailq is
set. Also, check the entire group set instead of just the
primary group. Both from John Gardiner Myers.
Don't have usrerr automatically print errno, since this is often
Use transienterror() in makeconnection after connect() fails and
in openmailer after execve() fails (from Eric Wassenaar).
Also moved transienterror() from util.c to conf.c.
Clean up from= logging on response messages.
Undo patch allowing prescan to return a null vector -- it breaks
Config: FEATURE(notsticky) lets you use UDB for everything coming
in to the machine, even if it is specifically targetted
to this machine. Without it, UDB is bypassed if the user
Config: fix another minor botch with <> (local mailer wasn't
Fix getrealhostname to return null if sinlen <= 0 -- this can
occur if stdin is a pipe.
Avoid infinite loop in getcanonname if name server return
Config: avoid having C flag qualify list syntax and error syntax.
Fix logging in deliver to not pass too many parameters to Ultrix
Don't write the pid file until after the daemon has actually
opened and conditioned the connection.
Consider addresses "different" if their q_uids differ (so that
two users forwarding to the same program will be seen
as different, rather than the same).
Fix problem with bad parameters in main() -- they set ExitStat
Fix null pointer references through RealHostName -- painfully
discovered by Allan E Johannesen of WPI.
Fix bug causing user@@localhost to core dump (yuch).
Config: don't put two @host.dom.ain on users in $=E in SMTP
mailer. Also, catch user@ (no host) in ruleset 0.
Config: add confCW_FILE as the name of the cw configuration file
(defaults to /etc/sendmail.cw). From P{r Emanuelsson.
Allow prescan to return a pointer to an empty list -- this is
not an error. Also, clean up error reporting to avoid
double errors (prescan reports once, then the caller
Changes to avoid trusting T_ANY queries -- run them, but if you
don't get the info you expected, do T_A and T_MX queries
anyhow. This also fixes an oversight where _res.options
If PRIV_NOVRFY is set, use 252 response code instead of 502 per
RFC 1123 section 5.2.3. It's not 100% clear that this
is correct, but it probably works better with stupid
mailers that do a VRFY and only check the first digit.
Fix uninitialized variable "protocol" in smtp code.
Include <unistd.h> in sendmail.h -- move towards POSIX/ANSI.
Additional hooks for RFC 1427 (ESMTP SIZE extension). This
includes requiring that enoughspace() know the system
block size, which will undoubtedly break most ports.
Trace flag 19 in use for srvrsmtp.c.
Additional logging -- notably the sending mailer name. This
also changes the delivery logging to strict field=value
Fix some problems with messages getting sent even to addresses
that had been marked bad -- from Eric Wassenaar.
More WIDE changes: accept host name inside [...] as non-MXed
host. This is intended ONLY for use inside firewalled
environments, where the MX points at the gateway.
Change .cf file conventions so that mapping for <> addresses
don't have an @ in them (to avoid confusing the C mailer
flag). Pointed out by Neil Rickert.
Config extensions for Sam Leffler's FlexFAX software.
Fix some more bugs in alias owner code -- there were some wierd
cases where an error in a non-aliased name would override
the return info in an aliased name with an owner.
Changes from WIDE Project, forwarded to me by Nakamura Motonori:
Log actual delivery host (after MX et al); from
Deliver Postmaster copies without a body.
Better logging of SMTP senders.
Send all program email as daemon even when local.
As requested in various forms from many people, accept -qIstring
to limit queue runs to jobs with queue-id matching string.
Similarly for -qRstring for recipients, -qSstring for
Initial hooks for ESMTP support (see RFC 1425).
Fixed a syntax error in the UUCP mailer specification that caused
Check for missing A= or P= arguments in mailer definitions.
Require FROZENCONFIG compilation flag to include frozen
configuration code. Frozen configuration is really
not a very good idea any more, particularly in shared
Do better checking of errno after opens of :include: and .forward
files to defer delivery on network and other transient
errors. Suggestion from Craig Everhart.
Fix minor botch in read timeout macro processing.
Add FEATURE(nouucp) to config files for sites that know absolutely
Add built cf files to distribution tape and clarify how to build
them if you don't have the Berkeley make.
Some sizeof(long) portability changes for the Alpha, from Allan
Add "restrictmailq" privacy flag -- if set, only people in the same
group as your queue directory can print the queue. If you
set this, be sure you also restrict access to log files....
Fix another bug in owner-list stuff that can cause data files to
Fix a bug with queue runs that cause forwards to yourself to go
into alias/forwarding loops. I'm still iffy about this
Fix from Eric Wassenaar for suppression of return message code.
Fix yet another problem in alias owner code -- put the wrong return
address on the enclosed return-to-sender letter.
Fix botch in alias owner code that caused it to not operate if the
error was detected locally.
M_LOCAL => M_LOCALMAILER to avoid conflict with Ultrix include
Miscellaneous bug fixes from Eric Wassenaar:
sendmail -bv -t logs the from line even though in verify
sendmail -v can go into queue mode if shouldqueue returns
Add route-addr pruning per RFC 1123 section 5.3.3. This can be
disabled using the "R" option.
Delete (always undocumented) -R flag (save original recipients);
there are ways to syslog(3) these now.
Clean up SMTP reply codes -- specify them as needed in the code,
instead of in conf.c -- this was needed during the NCP to
TCP transition, but seems silly now. This also changes
parameters to message and nmessage.
Have mailstats read the .cf file to find the sendmail.st file and
get text versions of mailer names. An initial version of
this code was provided by Tuominen Keijo (although the
comments indicate the good bits were written by "E.V.").
Add yet more System V compatibility hacks.
Fix bug in VRFY code (assumes everything must be a local user).
Allow specification of any of the hard-wired pathnames in the
Delete concept of "trusted users" -- this really didn't provide
any security anyway, and caused some problems.
Delete last vestige of support for the word "at" as an equivalent
Propagate owner-foo alias information into the envelope sender.
Based on code from John Gardiner Myers. This is a major
semantic change -- beware!
Allow $@ on LHS to indicate "match zero" -- this is used to match
Don't "lose" queue runs. Very important fix from (who else?)
Completely reset state on RSET command -- from Eric Wassenaar.
Send error messages and return receipts using an envelope sender
of <> regardless of the setting of $n. Rewriting rules
can undo this if they feel the necessity, as might be
needed for networks that don't understand the syntax.
This is permitted by RFC 821 section 3.6 and required by
RFC 1123 section 5.3.3. THIS REQUIRES VERSION 4 CONFIG
FILES because the rulesets must be able to parse <>
Don't ever send error messages to "<>" -- they will get sent to
the local postmaster or dumped in /usr/tmp/dead.letter
instead. Per RFC 1123 section 5.3.3.
Explicitly check for email to yourself as a dotted quad. You
have to call $[ [ ... ] $] to get this.
Up the message timeout to five days per RFC 1123 section 5.3.1.1.
Make all read timeouts individually configurable, as strongly
recommended by RFC 1123 section 5.3.2.
Use f_bavail (blocks available to regular users) instead of f_bfree
(blocks available to superuser) in free block checks.
Change $d macro to be the current time, not the origination time,
since this is consistent with how it is used now.
Generalization of enoughspace from Eric Wassenaar covering
SGI, Apollo, HPUX, Ultrix, and SunOS.
Ignore process group signals -- some front ends can do this if
you kill a window too quickly. From Eric Wassenaar.
Close all cached connections before calling mailers and after
forking for delivery (caused double closes which resulted
Add FEATURE(redirect) in config files -- this allows you to alias
old addresses to a pointer to the new address that will
give a 551 error message, but not deliver the mail.
Some code changes to make the 551 errors look pretty.
Names of M4 program paths in config files have changed -- they
are all XXX_MAILER_PATH now, to match XXX_MAILER_FLAGS.
Fix a bug in the QSELFREF code having to do with empty .forward
files, reported by Eric Wassenaar.
Add option "p" (privacy flags); this allows you to tune how
picky the SMTP server will be. This also adds the
confPRIVACY_FLAGS M4 macro in the config files.
Add option "b" (minimum blocks free). If there are fewer than
this number of blocks free on the filesystem containing
the queue directory, the SMTP MAIL command will return
a 452 response and ask you to try again later. This
also adds the confMIN_FREE_BLOCKS M4 macro in the config
Made VRFY just verify (doesn't expand aliases and .forward files);
EXPN does full expansion. RCPT in queue-only mode also
doesn't chase aliases and .forward.
Increase the number of domain search entries in domain.c to allow
for the extra "" entry indicating the root domain.
Reported by Nakamura Motonori of Kyoto U.
Add a "SMART_HOST" in the configs for UUCP-connected sites that
want to forward all mail with extra "@"s to that site.
Also allows SMART_HOST, LOCAL_RELAY, and MAIL_HUB to
be specified as ``mailer:hostname'' to use an alternate
Clarified and updated some wording in the Operations Guide.
Add the "c" mailer flag -- this suppresses all comment parts of
addresses (requested by John Curran of NEARnet).
Have -v print prompts in -bt mode even if stdin is not a terminal
(default behaviour is to be silent if not reading from
a terminal). Suggested by Bryan Costales, ICSI.
Move the metacharacters from C0 space (\001-\037) into C1 space
(\201-\237). This also fixes a bunch of potential bugs
with G1 characters (\240-\276) in headers relating to
negative numbers passed to isspace() et al.
Add YP_LAST_MODIFIED and YP_MASTER_NAME to DBM version of alias
database if YPCOMPAT is #defined. Enhancement from
Takahiro Kanbe of Fuji Xerox Information Systems Co., Ltd.
Add "list" Precedence (-30); this can be used with old sendmails
which will map to precedence 0 (which will return error
messages). Suggested by Stephen R. van den Berg.
Many bug fixes from Eric Wassenaar of the National Institute for
Nuclear and High-Energy Physics, Amsterdam:
Clear timeouts properly on open failures in include().
Don't dereference through NULL if no home directory found.
Re-establish SIGCHLD signal on System 5 in reapchild().
Avoid NULL pointer reference on -pFOO flag.
Properly handle backslash escapes in comments.
Correctly check reply status on SMTP NOOP command.
Properly save SMTP error message if peer gives
"Service Shutting Down" message.
Avoid writing to the transcript if it couldn't be opened.
Signal errors in SMTP children to parent properly.
Handle self references in a list more globally (include a
QSELFREF bit in the address flags). This enhancement
was suggested by Eric Wassenaar.
Use initgroups() in hpux, even though it's System-V based. The
HASINITGROUPS compile flag can set this on other systems.
This HPUX behaviour was pointed out by Eric Wassenaar.
Clean up handling of LogLevel to make it easier to figure out
Change log levels to have some consistency:
1 serious system failures, security problems
2 lost communications, protocol failures
6 vrfy logging, creation of return-to-sender
9 delivery tempfails (queue ups)
Allow IDA-style separated processing on S= and R= in Mailer
definition lines. Note that rulesets 1 and 2 are
still used for both addresses as before. Bruce Lilly
gave a convincing argument that RFC976 insists on
Added some time zones to arpatounix -- they may not be in the
standards, but they are in use. However, I may delete
arpatounix entirely -- there appears to be no reason
Change to UUCP mailer (in cf directory) to try to do a saner job.
I'm still not certain about this mailer in general.
Fix bug that prevents saving letters in ~/dead.letter.
Don't add angle brackets in VRFY command if angle brackets already
Fix bogus error message in udbexpand.
Null terminate host buffers in buildaddr (broken in 6.21) --
Fix another incorrect error message in alias.c, found by Azuma
Fix a couple of problems in the more-configurable config files,
found by Tom Ivar Helbekkmo.
Fix problem with quoted :include: entries.
Don't duplicate the filename on verbose printing of .forward and
Extend size of prescan buffer (to allow bigger addresses). Also,
detect some buffer overflows.
Log user SMTP protocol errors (log level 4).
Fix another problem in the MCI state machine caused when there
were errors generated from the other end to commands
Include load average support for DEC Alpha running OSF/1.
Fix multiple-response problem with errors in MAIL From: line.
Fix SMTP reply codes for invalid address syntaxes (give 501;
never give multiple error messages for a single message).
Fix problem where a cached connection timeout rejects all
later connects to that host.
Fix incorrect error message if alias.c is compiled with DBM only.
Additional changes to fix nested conditionals (from Bruce Lilly).
Recover more gracefully from operating system failures, particularly
NULL returns from openmailer (from Noritoshi Demizu,
Log forward, alias, and userdb expand operations on log level 10;
concept suggested by P{r (Pell) Emanuelsson.
Changes for HPUX 8.07 compatibility.
Allow any config option to be set using an M4 define.
Change UNAME compile flag to HASUNAME for IDA compatibility
(besides, it's a better name).
Note in README that on SunOS it must be linked -Bstatic.
Fairly major change in domain.c to handle wildcard MX records
more rationally. NOTE: the "w" option (no wildcard MX
records match local domain) has been eliminated.
Fix some unset variable references pointed out by Bruce Lilly.
Fix host name in process titles when using cached connection.
Fix System 5 compatibility changes to be compatible with the rest
Experimental fix for problem handling errors in the SMTP
protocol in conjunction with connection caching.
System 5 compatibility changes.
Fix a bug that causes local mail delivered using -odq to be
eliminated as a duplicate (because it matched the
ctladdr, now passed in as a C line). These changes
Add debugging for some MCI errors.
Fix -e compatibility flag to take a value.
Fix a couple of minor compilation warnings on Sun cc.
Improve error messages in a few cases to be more self-explanatory.
Fix yet-another problem with environment handling, pointed out
by Yoshitaka Tokugawa and Tom Ivar Helbekkmo.
Some heuristics to try to limit resource exhaustion problems
if a downstream host has been down for a long time.
Fix problem with incorrect host name being logged in "Connection
timed out" messages (from Tom Ivar Helbekkmo).
Fix some ANSI C problems (from Takahiro Kanbe).
Properly log message sender on returned mail during queue run.
Count number of recipients properly.
Fix a problem in yp map code.
Diagnose "message timed out" (from Nakamura Motonori).
Fix problem with address delimitor inside quotes.
Define $k and $=k to be the UUCP name (from the uname call)
based on code from Bruce Lilly.
Implement arpatounix (largely code from Bruce Lilly).
Log more info (suggested by John Myers).
Allow nested $?...$|...$. (inspired by code from Bruce Lilly of
POSIX compatibility (noted by Keith Bostic).
Handle SMTP MAIL command errors properly (urged by several people,
notably John Myers of CMU).
Do early diagnosis of .cf errors (notably referencing a RHS
substitution that isn't on the LHS).
Adjust checkpointing to better handle batched recipients, suggested
(config files:) Implement MAIL_HUB for all local mail (to handle
NFS-mounted directories) as urged by Tom Ivar Helbekkmo
of the Norwegian School of Economics.
Environment handling simplification/bug fix -- child processes
get a minimal, fixed environment. This avoids different
Handle commas inside comments properly.
Properly limit large messages submitted in -obq mode.
Check mtime of thaw file against .cf and sendmail binary, based on
MX piggybacking, based on code from John Myers@CMU.
Allow checkcompat to return -1 to mean tempfail.
Bug fix in m_mno computation.
Tuning of queueing functions as recommended by John Gardiner Myers.
Return mail headers (no body) on messages with negative precedence.
Fix botch causing queued headers to have ?XX? prefixes.
Changes to recognize special mailer types (e.g., file) early.
Check for control characters in addresses.
Fixed deferred error reporting.
Report duplicate aliases.
Handle mixed case recursive aliases.
Put return-receipt-to on a conf.c flag (but don't set it).
Fix minor syslog problem.
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