I've written a policy for the Postfix MTA that allows Postfix to
determine if TMDA would bounce an email during the SMTP session,
instead of during final delivery. This does a couple of things:
1) Reduces the use of bandwidth for messages that are going to
be bounced anyway. The email is bounced during as soon as the
sender and the receiver is received by the MTA.
2) It reduces the impact of a forged sender address. The bounce goes
directly to the server that is connected, instead of to whatever
is in the sender address.
I have plans on releasing a version that's written in python to
increase the speed, reduce the number of external dependancies,
and allow it to include ACTION_INCOMING, ACTION_FAIL* and
ACTION_EXPIRED_DATED in it's decisions.
More information & download here:
http://wiki.tmda.net/TmdaPostfixPolicy
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