Backscatter & challenge response

Paul Houselander (SME) housey at
Fri Apr 11 09:23:57 IST 2008


In common with lots of people I've seen a massive increase in the amount of
backscatter my domains are getting. I implemented watermarking which has
helped a great deal.

What I'm getting complaints about now are the mails coming in from annoying
challenge response systems, the mails don't come from postmaster, <> etc...
so the watermark does not get looked at.

Just wondered if anyone had any bright ideals as to how to combat it?

I've been looking at a selection I've been sent through this morning and
there doesn't seem to be anything consistent about them and there not
hitting many spamassasin rules.



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