links together aliases into proper trees. This is in part an

links together aliases into proper trees.  This is in part an
attempt to do the SMTP VRFY command properly, but there are a number
of annoying problems that convince me that this is the wrong way to
do it.  Sigh.

SCCS-vsn: usr.sbin/sendmail/src/alias.c 3.26.1.1
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.54.1.1
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.52.1.1
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.33.1.1
SCCS-vsn: usr.sbin/sendmail/src/util.c 3.12.1.1
SCCS-vsn: usr.sbin/sendmail/src/main.c 3.53.1.1
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 3.8.1.1
SCCS-vsn: usr.sbin/sendmail/src/headers.c 3.10.1.1
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 3.28.1.1
SCCS-vsn: usr.sbin/sendmail/src/queue.c 3.4.1.1