[Mailman-Users] Giving away the secrets of 99.3% email delivery

Mark Sapiro mark at msapiro.net
Sun May 13 06:51:57 CEST 2012

David wrote:
>I have DKIM implemented with opendkim and Postfix and messages sent out via
>sendmail are signed properly.
>However, messages sent out to the list's users by Mailman are not DKIM
>signed. Any suggestions?

Is Mailman sending outgoing mail via your local Postfix.

These headers from yor post at

Received: from myhost.hostingprovider.com (localhost [])
       by localhost (Postfix) with ESMTP id E9CA1123AB;
       Wed,  9 May 2012 21:43:23 +0000 (UTC)
X-Original-To: list at lists.example.com
Delivered-To: list at lists.example.com
Received: from fmailhost01.isp.att.net (fmailhost01.isp.att.net
 []) by localhost (Postfix) with ESMTP id 1D84D123A4
 for <list at lists.example.com>; Wed,  9 May 2012 20:52:06 +0000 (UTC)

indicate that it is.

Why such mail would not be DKIM signed by Postfix when mail submitted
via the Postfix sendmail command is DKIM signed by Postfix probably
has to do with the Postfix/opendkim configuration and is not something
I can answer offhand.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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