Re: [PLUG] Backup MX Question

[John Von Essen <john@essenz.com>]

If you are blocking spam by using access feature in sendmail, then your
sort of screwed with the whole outbound reply queue issue. Sendmail will
send a bounce back, but the From: address is garbage, yada, yada...

I dont know of any easy way to get around this. One way would be to spoof
local delivery of those domains your blocking, so the bounce would get
delivered locally, where you could route it to /dev/null. Problem with
this is its at the domain level, and would require alot of configs.

Another solution is to write a perl script to search through
/var/spool/mqueue and have it delete files that reference those bogus
domains and senders.

My recommendation is to move to a more sophisticated milter setup, like
MIMEDefang. There you can do things like silent discards, etc.,.

-John

On Fri, 2 Jun 2006, Andrew Libby wrote:

>
> I've heard that spammers will default to the lowest priority MX in the
> belief that
> the anti-spam measures used at this level are not as thorough as those
> at the higher
> (highest) priority MX.
>
> If I recall correctly, one approach was to have a third MX that
> basically trashes everything
> as a spam subversion measure.  There may be more to the configuration
> than that, but I don't
> recall.
>
> Anyone heard of this, know more about this?
>
> Thanks.
>
> Andy
>
>
> 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?
> >
> >
>
>
> --
> Andrew Libby
> alibby@philadelphiariders.com
> http://philadelphiariders.com/
>
>
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