From: Bjørn T Johansen (btjhavleik.no)
Date: Thu Aug 21 2008 - 08:27:07 CDT

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On Thu, 21 Aug 2008 09:17:43 -0400 (EDT)
wietseporcupine.org (Wietse Venema) wrote:

> Bj?rn T Johansen:
> > > > > Please read the documents that I referred you to.
> > > >
> > > > Yes, I did but I am not sure what the solution is? I see that the D flag adds a Delivered-To header and that
> > > > it checks the mail to see if it already has a Delivered-To header and the message is returned as undeliverable
> > > > if so, as of version 2.5.x...
> > > > But is the solution to this to remove the D flag from the pipe transport? Or should I increase
> > > > dovecot_destination_recipient_limit from 1 to 2?
> > >
> > > Given this description:
> > >
> > > D Prepend a "Delivered-To: recipient" message header with
> > > the envelope recipient address. Note: for this to work,
> > > the transport_destination_recipient_limit must be 1 (see
> > > SINGLE-RECIPIENT DELIVERY above for details).
> > >
> > > The D flag also enforces loop detection (Postfix 2.5 and
> > > later): if a message already contains a Delivered-To:
> > > header with the same recipient address, then the message
> > > is returned as undeliverable. The address comparison is
> > > case insensitive.
> > >
> > > This feature is available as of Postfix 2.0.
> > >
> > > Which solution would you pick when mail is returned as undeliverable
> > > because a "mail forwarding loop" was detected?
> > >
> > > You will have to use your own brain cycles.
> > >
> >
> > Well, I just thought that the D flag was included for a reason
> > and that removing the flag maybe would break something else...
>
> > Instead of wasting time to write such long answer maybe a simple
> > yes or no would be sufficient....... Isn't that the idea with a
> > mailinglist, getting help and verify solutions or am I misunderstanding
> > something??
>
> No, the purpose is to help you choose the best solution. It's your
> system. You decide what is best.
>
> - One possibility is to stop using the D flag and thereby disable
> loop detection in the pipe mailer (which didn't work before
> Postfix 2.5).
>
> However it is possible that you have other mail software that
> depends on the presence of this header. Only you can make that
> determination, not this mailing list.
>
> - Another possibility is to keep loop detection, and to fix the
> system that falsely prepends the Delivered-To: header BEFORE mail
> is given to Postfix.
>
> Wietse

That's the answer I was looking for, thx! :)

BTJ

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