> You can look at the old BSD vacation script for an excellent reference 
> for what a vacation auto-responder should (and more importantly, should 
> *not*) reply to... but essentially it is:
> 
> 1. Don't respond to:
> 
> bulk/list mail
> null senders
> anything tagged as spam

So whenever a piece of spam pass undetected your sending your vacation
messages to an innocent person !
Wow.. that's what I call backscatter. Find 1.000 systems configured as
yours, send 1 message each with a forged return address and I have a small
ddos !

Ok, I understand that using ASSP there is no such thing as a piece of
undetected ube, but yours is exactly the kind of configuration giving me the
most troubles in keeping my users mailbox clean when their addresses are
used by spammers. And what you do is sending unsolicited email. Once a day
or once per week, that's not the point. Your logic can be applied to c/r
systems too, antivirus notification or to user validation callouts. I call
them backscatter.

And we filter them exactly the same way as other kind of backscatter.

Again, I know you're not causing troubles because ASSP keeps you 99% sure
that your vacation notice never go to forged address, that's not always the
case. And if you ever seen a mailbox when a spammer forges a return address,
you know that the most difficult thing to filter are all the exotic vacation
notice (Abwesenheitsnachricht, Abwesenheitsnotiz, Autorespuesta, automatique
d'absence du bureau, Automatisch antwoord bij afwezigheid, Periodo
vacacional, Automatisk svar ved, ecc.). Some just quote the subject, so you
have to inspect the body to try to understand in Chinese etc what they tell
you. So at least pls use a subject so I can easily filter your email.



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