[Web-cyradm] HOW TO: Rejecting Unknown Local Recipients ??

[Leon Kolchinsky]

> >  I need some help.
> >  Right now we are using greylisting / spamassasin / antivirus and so on,
> > but, now spammer are gentting really more "smart":
> >  if a spammer use a real SMTP bypass the greylist, and if the mail is
> well
> > formatted it may by-pass also the spamassasin.
> >  It's quite normal, but the point is, if a large number of email are
> send to
> > a non existing user these email are processed and only at the end a mail
> > form MAILER DEAMON is send for a not existing user... so a lot of mail,
> more
> > than 2500 in some server a day, are processed... and in some case the
> queue
> > is really overloaded.
> 
> Hi Andrea
> 
> Yes, we're experiencing this too. I think this phenomenon is known as
> 'backscatter'. See:
> 
> http://www.postfix.org/BACKSCATTER_README.html
> 
> and
> 
> http://www.hispalinux.es/~data/postfix/
> 
> HTH
> 
> Have a great day!
> 
> Stuart
> 


It's not clear to me if he talking about backscatter.

But if he is, there is a vbounce plugin for SA.



Regards,
Leon Kolchinsky