prototype functions

first cut at :mailsender extension

don't use %e for syslog errors -- either %m or errstring

minor tweaking of syslog levels & compile fixes for SunOS & Ultrix

have getmxrr look at $=w to determine local host name

hooks for eventual better handling of SMTP recipients

eliminate use of sin_len

initial hooks for ISO networking

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

fix botch in SMTP VRFY code (assumed all users were local)

overhaul status of SMTP reply codes

add EF_VRFYONLY support

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

make duplicate deletion more global

move the meta-characters from C0 into C1 space

Allow saving in ~/dead.letter; clean up VRFY output; fix bogus
error message in udbexpand; null terminate host buffers in buildaddr
(broken in 6.21).

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

System 5 compatibility, misc fixes

put getmxrr on NAMED_BIND

Release 6

change random constants to be #defines

(partially) ANSI-fy it

reduce number of instances of CurEnv by passing it as a parameter

add generalized database mapping (using the K config line and
$( ... $) syntaxes); $[ ... $] is now a special case