Rafael Azevedo - IAGENTE:
> I truly believe that postfix is the best MTA ever, but you might
> agree with me that when the receiver start blocking the sender,
> its worthless to keep trying to deliver.
1) Postfix will back off when the TCP or SMTP handshake fails. This
is a clear signal that a site is unavailable.
2) Postfix will not back off after [54]XX in the middle of a session.
IN THE GENERAL CASE this does not mean that the receiver is blocking
the sender, and backing off would be the wrong strategy.
Wietse
