[PLUG] Re: Sendmail backup MX queuing spams

[Tom Diehl <tdiehl@rogueind.com>]

On Fri, 2 Jun 2006, Michael Bevilacqua wrote:

> Hey-
>
> I recently setup a new backup MX for a large volume mailhost and found
> the backup MX host queuing thousands of spam. As per the sendmail
> documentation I disabled double bounces using:
>
> define(`confDOUBLE_BOUNCE_ADDRESS',`')dnl
>
> However this doesn't solve the problem of the volume of messages that
> are stored in the mail queue. I looked around the net for some answers
> but all of the solutions were either proprietary or less than 'data'
> safe. Am I missing some obvious feature?

I do not know how to do this in sendmail but most likely your problem
is that you are accepting mail for any_user@domain.com. When the backup
tries to hand off the message to the primary then it bounces the mail
for the invalid users. You need to tell then backup to only accept mail
for valid users OR drop the backup mx.

With postfix this is not hard to do assuning you can get a list of valid
users. I am sure there is a way to do this with sendmail but I dumped
sendmail years ago and have forgotten everything I knew about it.

Hope this helps,

Tom
___________________________________________________________________________
Philadelphia Linux Users Group         --        http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug