From: Wietse Venema (wietseporcupine.org)
Date: Sun May 25 2008 - 07:57:42 CDT

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Steven King:
> I am in need of a bit of clarification.
>
> This has to do with the _destination_recipient_limit parameter = 1.

As documented, this controls how Postfix DELIVERS mail, not how
Postfix RECEIVES mail.

default_destination_recipient_limit (default: 50)
       The default maximal number of recipients per message delivery. This is
       the default limit for delivery via the lmtp(8), pipe(8), smtp(8) and
       virtual(8) delivery agents.

       Setting this parameter to a value of 1 changes the meaning of the cor-
       responding per-destination concurrency limit from concurrency per
       domain into concurrency per recipient.

> When this parameter is specified when Postfix encounters mail with
> multiple recipients how does it handle the mail? Does Postfix skip the
> policy check all together or does it break the message apart 1 message
> per destination recipient and feed it through the policy?

As documented, the policy delegation protocol controls how Postfix
RECEIVES mail, not how Postfix DELIVERS mail.

        Wietse

> I do know that after mail is queued during the clean up phase Postfix
> will end up breaking up a message with multiple recipients into
> individual messages.
>
> Just not 100% sure how it all fits together.
>
> Thanks
>
> Steve King
> Senior Linux Administrator - Liquid Web, Inc.
> CompTIA Linux+ Certified Professional
> CompTIA A+ Certified Professional
>
>

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