HPUX and OSF/1 support; fix SMTP reply codes & multiple SMTP error
problem; consider cache timeout non-permanent; be more graceful on OS
failures; log forward, alias, and userdb expansions on log lev

HPUX and OSF/1 support; fix SMTP reply codes & multiple SMTP error
problem; consider cache timeout non-permanent; be more graceful on OS
failures; log forward, alias, and userdb expansions on log level 10

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fix wildcard MX handling (option W no longer needed); fix
process title when using cached connection; many minor fixes

fix the System 5 compatilibility to be compatible with the rest
of the world.

fix mci_state after sending RSET command

some (iffy) changes to prevent suppressing the actual sender
during a queue run (interaction with C line in qf file)

log all instances of setting stat to EX_INTERNAL (Internal error)

fix -e compat flag; a few compilation warnings; improve error messages

more environment problems; limit resource exhaustion; fix incorrect
name in Connection timed out message; ANSI C fixes; log message sender on
returned mail during queue run; count recipients properly

more environment problems; limit resource exhaustion; fix incorrect
name in Connection timed out message; ANSI C fixes; log message sender on
returned mail during queue run; count recipients properly; fix YP code;
diagnose "message timed out" properly

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fix problem with address delimitor inside quotes; define $k and $=k
to be the name (from the uname call)

implement arpatounix; log more info; allow nested $?...$|...$.;
POSIX compatibility; handle SMTP MAIL command errors properly;
do early diagnosis of .cf errors; adjust checkpointing; misc bugs

environment handling simplification/bug fix; handle commas inside
comments; properly limit large messages in -obq mode

jgm+@CMU.EDU: check mtime of thaw file against .cf and sendmail binary

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
<jgm+@CMU.EDU>; return mail headers (no body) on messages with negative
precedence; minor other bug fixes

fix botch causing queued headers to have ?XX? prefixes

changes to recognize special mailer types (e.g., file) early

pass timeouts to sfgets; check for control characters in addresses;
fixed deferred error reporting; report duplicate aliases; handle mixed
case recursive aliases; misc fixes

put return-receipt-to on a conf.c flag (but don't set it);
fix minor syslog problem

Release 6

fix aliases to print error messages (rather than core dumping);
allow words as error codes to $#error mailer

change random constants to be #defines; getopt-ify main.c

add NIS map type; log message-id in same line as from logging

allow I option to arbitrarily set and clear resolver options

when searching the name server, when there is at least one dot,
search the unmodified name first (this is so foo.cs will get the
Czechoslovakian foo, for example)

log host name on reply: read error message