The first couple items listed in the release notes for this new sendmail
(which are at http://www.sendmail.org/releases/8.14.0.Beta4.php#RS)
There are some milter-like things, or rather, things we had to do with
a milter if we did them at all. Their availability might make rejection
for bad DNS and HELO more common.
CONFIG: New FEATURE(`require_rdns') to reject messages from SMTP
clients whose IP address does not have proper reverse DNS.
Contributed by Neil Rickert of Northern Illinois University
and John Beck of Sun Microsystems.
CONFIG: New FEATURE(`block_bad_helo') to reject messages from SMTP
clients which provide a HELO/EHLO argument which is either
unqualified, or is one of our own names (i.e., the server
name instead of the client name). Contributed by Neil
Rickert of Northern Illinois University and John Beck of
Sun Microsystems.
CONFIG: New FEATURE(`badmx') to reject envelope sender addresses
(MAIL) whose domain part resolves to a "bad" MX record.
Based on contribution from William Dell Wisner.
All of these are a little dangerous. Notably, an smtp server should
accept mail with bad HELO strings from clients.
Joe Brennan
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