Helo, I'm currently testing a "new" feature on the mailing-list server.
The idea is to revive a feature that we introduced in OpenSMTPD a long time ago but which got removed for what I think were bad reasons: the kicker. The kicker is a mechanism that detects if a session is progressing towards mail delivery or if it's performing command that allows it to keep a connection open indefinitely by starting aborted transactions, playing RSET or NOOP games and a bunch of other unexpected yet legal SMTP moves. You can see it in action by connecting to mx-in.poolp.org then trying to keep a connection active by submitting commands that avoid DATA, like for example: HELO foo NOOP MAIL FROM:<f...@bar.baz> RCPT TO:<gil...@poolp.org> RSET MAIL FROM:<f...@bar.baz> RCPT TO:<gil...@poolp.org> RSET .. I deployed yesterday on the list server and am currently monitoring to ensure a legitimate session doesn't get killed and that my threshold is fine. Cheers,
