Hi !!
>>meybe it's not a bounce but somebody trying to validate your address
>>using callouts or somebody trying to verify that your domain is RFC
>>compliant and accepts mail to postmaster. do you reject at
>>after rcpt to or after data/predata ?
>
> After rcpt to. Callouts to an address other than the one you're receiving
> mail from are, in my opinion, broken. If they're trying to see if I accept
> mail to postmaster, they should use a non-empty envalope sender.
well, nobody says callouts are used to test addresses other than the
envelope sender. Testing email addresses is done by using a null
envelopesender, never using non-empty envelope senders. In the other
hand receiving mail from null envelope sender is REQUIRED by RFC and
you could end listed at rfc-ignorant
> I don't do this on all my domains, just ones where I've gotten excessive
> backscatter spam to postmaster, abuse, etc.
by our experience, this measure has no impact on the amount of spam
received, there are other means to stop spam other than break you
server configuration.
--
Best regards ...
It's a fine line between fishing & standing still
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