David,
----- Original Message -----
From: "David F. Skoll" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, June 20, 2006 5:06 PM
Subject: Re: [Mimedefang] Should I try to doMIMEDefang withMailscanner
forbackup MX
Steve Campbell wrote:
I have two mailservers, and for the sake of simplicity, two domains. The
mailboxes for domain1 are on server1, and the mailboxes for domain2 are
on server2. Server2 is the backup MX for domain1, lower priority, higher
number. Server1 is the backup MX for domain2, lower priority, higher
number. Server1 relays to server2 for domain2. Server2 relays to server1
for domain1.
OK; got it.
[...]
I would like for MD to do the milter-ahead style stuff and only accept
mail for domain1 from server2 when server1 is inactive. Mail should be
going through the primary MX, not the secondary. So mail for domain1
that is sent to server2 would have to wait until MD determines whether
server1 is accepting mail or not and if it is for a valid user of
domain1. If server1 is accepting mail, drop the mail silently. If the
user is invalid, obviously drop the mail.
Trust me: You don't want to do that. If you do, you will have a
nightmarish
time diagnosing what's going on. server2 might think that server1 is up,
when outside people really can't see server1. Or server2 might think it's
down when it really is up.
Your best bet is to put the same spam-scanning rules on both servers,
and have each server periodically synchronize its list of valid
recipients to the other server. (For example, you could store all the
valid recipients in a Berkeley DB file and do a simple hash lookup in
Perl to tell if the recipient is valid.)
Excellent idea! An MS Custom Function. Only problem, remember, is that I
don't do Perl yet. But I hadn't thought of that way before. It would work.
And I am learning Perl, and since I just wanted opinions, this may be the
end of this thread.
Thanks very much!
Steve
That way, each server can make its filtering decisions independently, and
you don't have to rely on network connectivity or other conditions beyond
your control to make accept/reject decisions.
Regards,
David.
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_______________________________________________
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