Hi Wietse,
So for me it still makes sense to combine postscreen with postgrey, as
postscreen works mainly on ip addresses (their reputation in fact) while
postgrey also takes care on sender's and recipient's e-mail addresses.
By design, postscreen does not know the sender or recipient.
In particular, when postscreen allows a remote SMTP client to talk
to a Postfix SMTP server process, it must make that decision before
the remote SMTP client has sent any commands.
Sure.
My point was that a combination of both seem to make sense. And I
brought an example to show it, similar to the situation that I asked a
couple of days ago.
I had another similar situation today, when the other server passed
postscreen and got greylisted in the beginning and then rejected by
postscreen due to blacklist entries. So the dns lifetime in the cache
works, too.
I'm still impressed how much spam you can get rid off just on smtp level.
Groetjes
Claus
