[exim] Bounce Spam problem

    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