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From: lst_hoe02 on 13 Nov 2009 08:24
Hello

as far as i know Postfix does not alter a Message-ID beside when it
creates a missing one. Is there some way one could find out later in
the logfile if Postfix has created one? Is it sufficient if the
Message-ID looks like "<some-long-numbar>@<my-mailrelay-hostname>" or
is there some other thing to check?

Many Thanks

Andreas

From: Sahil Tandon on 13 Nov 2009 18:00
On Fri, 13 Nov 2009, lst_hoe02(a)kwsoft.de wrote:

> as far as i know Postfix does not alter a Message-ID beside when it
> creates a missing one.

There is more to it since the release of 2.6. From RELEASE_NOTES:

Major changes - header rewriting
--------------------------------

[Incompat 20090330] Postfix now adds (Resent-) From:, Date:,
Message-ID: or To: headers only when clients match
$local_header_rewrite_clients. Specify "always_add_missing_headers
= yes" for backwards compatibility. Adding such headers can break
DKIM signatures that cover headers that are not present.
compatibility with existing logfile processing software, Postfix
will log ``message-id=<>'' for messages without Message-Id header.

> Is there some way one could find out later in the logfile if Postfix
> has created one? Is it sufficient if the Message-ID looks like
> "<some-long-numbar>@<my-mailrelay-hostname>" or is there some other
> thing to check?

When adding a missing Message-Id: header, the cleanup(8) service uses
the queue file creation time (in GMT), the queue ID and $myhostname.
For example:

message-id=<20091113223127.8814B1708C(a)mailin.kwsoft.de>
^^^^^^^^^^^^^^ ^^^^^^^^^^ ^^^^^^^^^^^^^^^^
time in GMT queue ID $myhostname

--
Sahil Tandon <sahil(a)tandon.net>

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