We've got a DU 4.0D box running behind a firewall that we'd like to run
sendmail 8.9.1 on. We also have an Exchange server behind the firewall
that actually manages mail delivery. The problem with using Exchange in
this capacity:
-
If you let it deliver using DNS, Exchange Internet Mail Service (IMS) will
exhibit a host of weird problems, including inexplicably spooling (rather
than delivering) mail to working Internet sites. The spool can grow rather
frighteningly quickly, devouring disk space.
-
If you let it accept incoming mail from the Internet, it will cheerfully
allow third-party relaying and a lot of other nonsense. (This is supposedly
fixed by Microsoft application note Q193922
, but I haven't seen it work, and in any event, IMS doesn't support the
extra anti-spamming goodies sendmail 8.9.1 does.)
-
Even if you use IMS's relaying option, if you relay to a third party out
on the Internet (say, a friendly machine operated by your ISP), IMS will
crash about once every five minutes if the firewall loses it.
Obviously, these are undesirable behaviors. As a result, I had given some
thought to using sendmail 8.9.1 on one of our Alphas, such that
-
Incoming Internet mail for our domain and internal-only mail is handed
off to the Exchange server.
-
Mail for the Internet is forwarded there directly via SMTP.
-
All mail regardless of sending host appears to come from this domain.
-
Mail for certain administrative users is forwarded to an aliased name and
then delivered appropriately.
-
Known spammers, third-party relay attempts, and anyone in Paul
Vixie's Realtime Blackhole List is kissed off.
I can live without the third item, but the first two are non-negotiable.
Anyone have any success with this version doing something similar? I've
been fooling around with some configuration files, but so far, to no success.
--
Robert L. McMillin | Not the voice of Syseca, Inc. | rlm_at_syseca-us.com
Personal: rlm_at_helen.surfcty.com | rlm_at_netcom.com
Received on Sat Nov 28 1998 - 22:52:43 NZDT