RFC 1413 (IDENT) protocol support

implement multi-word classes

improve error reporting; open new transcript on envelope cloning

include a warning timeout after some interval; get rid of QueueRun
global and put it in the envelope; some other minor bug fixes

move SendMode and ErrorMode into the envelope

leading blanks in aliases can cause "unparsable" from addresses

restore e_sender as sending address sans decorations

clean up file locking (create a lockfile() routine in conf.c)

delete e_sender and e_returnpath; fix some bugs in envelope splitting

change (simplify) user and host UPPER => lower case mapping

allow prescan to return a null vector; fix some duplicate prescan errs

changes for ESMTP; mostly better delimiter character pointer passing

header file cleanup; primarily #include <unistd.h> in sendmail.h
and delete duplicate cruft

hooks for SMTP Service Extensions

better handling of transient errors

fix yet another problem with new owner-foo implementation

delete trusted users code; it's too easy to circumvent

overhaul status of SMTP reply codes

$d is current date, not origination date

close cached MCI connections after a fork; add p (privacy) and b
(min blocks free) options; fix selfref code; clean up $#error format

more bug fixes from Eric Wassenaar

clean up log levels; allow IDA-style split header/envelope rewriting;
extend arpatounix with more zones (but is this even needed?)

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

show more ...

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.