redefine $r, $s, and $_ in error envelopes; properly handle
parseaddr return in ESM_POSTMASTER case

change comment on MAXUSERENVIRON to emphasize min value

reset statmsg before each mailer invocation to avoid bogus messages
in log

shorten timeout on reverse name lookup to avoid conflict with
higher level timeouts

more socket code generalization

properly diagnose ruleset zero returning null vector

fix major bug in reply() that trashes all error messages; add
IDA-style $&x handling; don't lose $s value in srvrsmtp; random POSIX
compatibility and similar cleanups

implement $&x for deferred macro expansion; some POSIX compatibility

fix loopback detection

clarify error messages

add MACRODEXPAND for deferred expansion

clarify comments for the unwary

set $s after runinchild; runinchild calls newenvelope which clears
the macros

clean up some debug messages if MATCHGECOS not compiled in

don't reset SmtpReplyBuffer on fatal errors -- VERY BAD BUG!

clean up error return messages

prioritize tasks

crude initialization of map_rebuild -- needs work yet

add map_rebuild for program to use for auto-rebuild

931 support done

D= mailer flag for directory path; RFC 1413 (IDENT) protocol support;
check for loopbacks in user instead of srvr SMTP

IDENT cleanup; move loopback checking from srvr to user smtp

RFC 1413 (IDENT) protocol support

add Directory mailer field

add execdir to mailer definition