Steffen Kaiser wrote:
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On Sun, 18 Jan 2009, Seth Mattinen wrote:
As a mail admin, I never want to see deliver generating its own messages to potentially forged addresses and spamming innocent people. The MTA should do this during the SMTP transaction.
Which MTA tries to deliver the mail during the SMTP dialogue? Neither Postfix nor sendmail does, unfortunately. Well, one would open yet another can of worms, if doing so, I guess.
Postfix. Will it do it out of the box? No. You can add hooks to Postfix using the pre-queue content filter, milter, access policy delegation or patches so that it can respond with a defer/reject during the SMTP session.
http://www.postfix.org/SMTPD_PROXY_README.html http://www.postfix.org/MILTER_README.html http://www.postfix.org/SMTPD_POLICY_README.html
I'm sure there are tools out there developed to take advantage of these interfaces that do what I'm alluding to, but I don't know any off the top of my head and I can't share mine.
~Seth