From: Victor Duchovni (no email)
Date: Mon Aug 11 2003 - 08:56:15 EDT
On Mon, 11 Aug 2003, Magnus [iso-8859-1] Bäck wrote:
> Given this catchall virtual alias domain,
>
> fax.scandorama.se null
> @fax.scandorama.se
>
> on Postfix 2.0.13, empirical studies have shown that a mail addressed
> to, say, and
> will be delivered twice to the mailbox.
>
> Is this well-defined behaviour that I can rely on? I didn't find
> anything about it in the man pages.
>
Duplicate elimination with Postfix 2.0 is on (orcpt, rcpt) pairs. The
latest snapshot has a new parameter (enable_original_recipient = yes)
which can be used to enable/disable this behaviour (it is enabled by
default).
> From my understanding, duplicate elimination only kicks in for the
> expansion of a virtual alias. Two original recipients will always
> result in at least two final recipients (due to X-Original-To).
> Correct?
>
The two (identical) recipients might become one again if sent over SMTP to
another system, this includes content filters. If you want two recipients
do virtual expansion behind the content filter. If you don't want two
recipients, try the snapshot, or expand before the content_filter (if you
have one).
-- Viktor.
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