[Mimedefang] Failed looping spam

[Marco Berizzi]

Usually I stop this horrible behaviour with /etc/mail/access

...
to:non-exist-user at mycompany.com ERROR:550 Mailbox disabled for this
recipient
...

However I have 1/10 of your mail traffic, and only 300 mailboxes
in my exchange server.

----- Original Message -----
From: "Tom Horan" <thos at esat.com>
To: <mimedefang at lists.roaringpenguin.com>
Sent: Friday, October 11, 2002 2:05 PM
Subject: [Mimedefang] Failed looping spam


> I currently do not run MIMEDefang on my mail system, but am currently
> testing it, and I'm wondering if it could help me resolve the problems
I am
> currently having.
>
> I have 2 linux/sendmail boxes in front of an Exchange server. I
usually see
> about 12/15k msgs per day.
>
> What I am seeing is a build-up of about 1000 messages on my outgoing
> sendmail box of failed spam.
>
> Spam comes in to joejoe at mycompany.com, and gets forward on to
Exchange,
> exchange says joejoe doesnt exist, so replies to sender to say mailbox
does
> not exist. Exchange then forwards on to my outgoing sendmail box where
it
> tries to send the mail. However, replying to the original spam address
> fails, and usually takes 4days to actually fail properly and get out
of the
> q, and so sendmail generates a failure report and sends the reply back
to
> exchange.
>
> I'm looking at using MIMEdefang with SpamAssassin, but would just be
tagging
> the email with a Spam-Score or altering the subject, it would not be
> possible for me to just drop spam mail when it hits my incoming
sendmail
> box. So the mail is going to hit Exchange regardless. I dont like
Exchange
> and so doing anything with a failed mail here probably wouldnt be an
option
> (however, I'm open to suggestion).
>
> So, what I'm really asking is -
> Is there anyway to detect a failed mail as spam and hence drop on my
> outgoing sendmail box ?
>
>
> Not sure if I made any sense here, but I'd appreciate any help
>
>
> Thanks,
> Tom