On Sun, Oct 04, 2009 at 10:48:12AM +0200, Laszlo Kupor wrote:
> > > I search documentation, and internet but not found solution to emulate
> > > Sendmail behavior in Postfix.
> > >
> > > The question i can emulate this in Postfix?
> >
> > No. Postfix never sends recipients for different transport:nexthop
> > combinations (the nexthop is typically the recipient domain) in the
> > same envelope.
> >
> > There are good reasons for this, it is difficult to do this and still
> > have a reasonable queue scheduling algorithm (Sendmail has no global
> > scheduling at all, which is far worse than occasionally splitting
> > envelopes).
> >
>
> Thanks for your reply, Sendmail stay here.
You are welcome to continue to use Sendmail.
> I can't go with you in this situation. The administrators view: this is
> big performance loss in some situation(maybe rare),
Postfix scheduling outperforms Sendmail scheduling in all but the most
exotic configurations. Postfix has no QueueLA/RefuseLA, which are
severely broken. Postfix continues getting work done without stop/start
congestion amplification and without saturating the machine.
> and can occurs
> duplicate mail delivery (i tested, for a day and overhead above 150%
> here).
Your tests don't mean much if you are testing isolated edge cases. If
the bulk of your load is to a set of domains served by a single pool
of MX hosts, you can add transport table entries:
example.com smtp:example.com
example.net smtp:example.com
example.org smtp:example.com
and then mail for all three domains is delivered in one envelope.
> I can't see clearly why good this, but i accept this is good.
> Just not for me and not for now. If you have a written documentation
> about queue mechanism please give me a reference.
http://www.postfix.org/QSHAPE_README.html#active_queue
--
Viktor.
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