A. Schulze:
>
> wietse:
>
> > A. Schulze:
> >> Hello,
> >>
> >> we're facing the following problem:
> >> postfix is configured to verify recipient addresses. The backend
> >> servers are mostly Exchange in various versions.
> >> Many of them use tarpitting. We guess that are default values.
> >> The address probe sent by postfix receive a result after 5 seconds
> >> delay. reason: tarpitting.
> >> Meanwhile postfix accept the message and we generate bounces later :-/
> >
> > That's because you configured it to accept mail.
> >
> > http://www.postfix.org/postconf.5.html#unverified_recipient_tempfail_action
> > http://www.postfix.org/postconf.5.html#unverified_sender_tempfail_action
> >
> > Wietse
>
> ok, thanks
>
> I currently fail on reproducint the "error". Maybe because my server
> isn't under stress now.
> May I force smtpd act with stress=1 for a specific smtp client?
SMTP server `stress' is a service feature, not a client feature.
You can offer customer-dependent MX service by using MX records
that resolve to different IP addresses.
> @Viktor:
> yes, you're right, our back-end servers shouldn't tarpitting our
> front-end servers.
> but that's a long term goal and require reconfiguration on customers
> back-end servers...
It all depends on who pays for it.
Wietse
