overhaul status of SMTP reply codes

overhaul status of SMTP reply codes

SCCS-vsn: usr.sbin/sendmail/src/usersmtp.c 6.14
SCCS-vsn: usr.sbin/sendmail/src/headers.c 6.11
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 6.16
SCCS-vsn: usr.sbin/sendmail/src/envelope.c 6.12
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 6.19
SCCS-vsn: usr.sbin/sendmail/src/err.c 6.6
SCCS-vsn: usr.sbin/sendmail/src/collect.c 6.8
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 6.19
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 6.11
SCCS-vsn: usr.sbin/sendmail/src/daemon.c 6.8
SCCS-vsn: usr.sbin/sendmail/src/srvrsmtp.c 6.16
SCCS-vsn: usr.sbin/sendmail/src/clock.c 6.2
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 6.23
SCCS-vsn: usr.sbin/sendmail/src/queue.c 6.17
SCCS-vsn: usr.sbin/sendmail/src/conf.c 6.25
SCCS-vsn: usr.sbin/sendmail/src/alias.c 6.16
SCCS-vsn: usr.sbin/sendmail/src/udb.c 6.11
SCCS-vsn: usr.sbin/sendmail/src/mci.c 6.5