joe-jobbed, block 'undeliverable' messages?

Dhawal Doshy dhawal at
Thu Apr 26 08:30:20 IST 2007

Quoting Chris Yuzik <itdept at>:

> Hi Guys and Gals,
> One of our domains has been joe-jobbed, big time. We're seeing multiple
> "undelilverable" messages per minute, and in some cases many from the
> same IP. This is the worst I've ever seen it. Short of sitting here
> adding each IP to a block list, is there any way I can filter these
> things out, tag them as spam, anything?

For postfix:

For sendmail:
Julian suggested 'milter-null' a few days back to someone with a  
similar problem..

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