tweaks & bug fixes to MIME algorithm

MIME 8 to 7 bit support

break out special local mail processing (e.g., mapping to the
"prog" mailer) onto separate mailer flags

reset h_errno in a few critical places to avoid spurious errors

compatibility with BIND 4.9.3 (just cleanup)

avoid returning error AND re-queueing for ``user@.'' address

fix problem with error messages on host names that have %s

fix relay= logging on queued messages

give return-receipt on delivery to mailing lists (instead of to the
members of that list) and suppress Return-Receipt-To: in subsequent
deliveries to avoid denial of service attacks and generally imp

give return-receipt on delivery to mailing lists (instead of to the
members of that list) and suppress Return-Receipt-To: in subsequent
deliveries to avoid denial of service attacks and generally improve
the semantics

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avoid bogus relay= logging

deliver all mail in a new session; this solves some security problems

change NAMED_BIND to a 0/1 flag to allow Makefile override

fix CNAME loop problem: gave error messages and requeued messages

avoid possible bogus pointer dereferences if there are %'s in the
250 response from DATA

make sure that you don't get bogus addresses queued up on
name server problems and split envelopes

tune short syslog buffers even more; have "too many hops" message
send to postmaster & be sure to completely deinstantiate the queue

fix problem that can cause mailer output to be discarded in some circumstances

fix extra commas in short buffer syslogging

changes from Eric Wassenaar: Apollo portability and improved network
error handling

improve logging

try to limit the overhead on split envelopes

tighten up short syslog buffers even more

preliminary try at controlling fd usage; doesn't work right
because main envelope qf doesn't get instantiated early enough

allow $s to be set to NULL for locally generated mail

change logging so that IP addresses always use [angle brackets]