2010/11/26 Wietse Venema <wie...@porcupine.org>:
> 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.
>
Thank you; I just searched for the offending domain, not the product.
Silly me...
