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Re: [LUG] Spam filter

 

Robin Cornelius wrote:
> 
> There is little you can do with backscatter, some spammer has found your
> email address and is sending forged from headers. Then the stupid server
> at the other end is believing the from header and trying to return the mail.

If you control all the generation of email for the domain, the Postfix
backscatter HOWTO describes ways of spotting bounces to email you didn't
send.

As well as generic ways of stopping such backscatter - alas for the
stuff we do at work this falls down at step one - we don't control how
email is sent for a domain.

> I don't know what the real solution is.

Remote servers shouldn't return email -- if they accept it they should
deliver it or have a very good reason for returning it - that is the
REAL solution to backscatter.

The "address" not existing, as in the example posted is not a sufficient
reason for backscatter. If it didn't exist, why did the mail server
accept it. Might have been acceptable in 1990, but it isn't now.


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