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Subject: Re: PIPELINING problem?
From: Wietse Venema (wietseporcupine.org)
Date: Sat Dec 23 2000 - 11:11:20 CST

Claus Assmann:
> Ok, at the risk of embarassing myself, I'll ask here... I've
> implemented SMTP PIPELINING in an MTA and test it against two other
> MTAs. This test revealed an interoperability problem between my MTA
> and Postfix. Now I'm trying to figure out what's going wrong. The
> test is as follows: send one e-mail with two recipients to a postfix
> MTA, the first of which is a non-existent user such that postfix
> returns 550 for it. The problem is that my MTA now hangs after
> reading that line, select() on the socket doesn't show readable
> data.

There was a bug in an early version of SMTP pipelining flushing
code that was fixed 20000511



        Bugfix: the 20000505 pipeline tarpit delay flush was wrong
        and caused the client and server to get out of phase. Yuck!