Arnim Sommer:
> Hello,
> unfortunately, @work we are hosted at microsoftonline.com.
>
> Since monday, we are getting mail delays with one of our partners, and
> I could track it down to address verification getting timeouts.
>
> Has anyone else seen that problem, or is it just one isolated problem?
See the "Pipelining of Sender Verify" thread, started yesterday.
This thread has SMTP session transcripts that allow anyone
to verify the nature of the problem.
The transcripts show that Microsoft mis-implements PIPELINING and
hangs up on receipt of QUIT, before it has replied to all the
commands that were sent before QUIT.
Older Frontbridge software did not have that bug (they were based
on Postfix). The newer version uses Microsoft's own mail software
which mis-implements RFC 2920.
Wietse
