> We have a Linux servers as mail backup server in case our primary
> goes down. Now spammers are sending the spam directly to the backup
> server that then tries to send it to our primary server. Since the
> backup server has to allow incoming mail to store-and-forward in
> case the primary is down, is there anyway I can avoid this?
Are you talking about incoming spam (mail to your users), our outgoing spam (they have
hijacked your mail server, sending 100,000's of E-mails)?
Some spamware sends E-mail to backup mail server(s) instead of the primary (I don't
know why). But, if the E-mail is destined to your users, they are going to get it
either way. FYI, our Declude JunkMail software will scan the mail whether it comes
directly from the source or from your backup mail server.
If you are talking about hijacking, then you clearly need to lock down your Linux mail
server. The method for doing that will depend on the type of mail server software you
are running. I'm not too familiar with Unix, so I can't help you there. If users
aren't using the backup mail server to send mail, then you could just have it receive
mail destined for your domain(s), which should be pretty easy to do (no need to deal
with trusted IP ranged and SMTP AUTH, that is needed if it can be used for sending
outgoing mail).
--
-Scott
Declude: Anti-virus and Anti-spam solutions for IMail. http://www.declude.com
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