[exim] Bounce Spam problem

[Hub Dohmen]

        Hi!

        

        I have a serious problem.

        

        Spammers are abusing our system by sending fake bounces to our server,
that Exim 'returns' to the 'sender'.

        

        How can ik ignore, of better, delete before accepting.

        

        I enabled blacklisting. But that fdoes not seem to have any effect.

        

        Cheers,

        Hub

         

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