On 2/1/22 18:52, Philippe B wrote:
But in a few very rare cases, at some point during the convoluted delivery path to the mailbox of the actual human owner of OURLIST, the recipient is changed from OURLIST-owner@OUR.DOMAIN to mailman@OUR.DOMAIN.
...
Received: from [172.17.0.2] (ec2-12-34-56-78.us-west-2.compute.amazonaws.com [12.34.56.78]) by SMTP-SERVER.OUR.DOMAIN (Postfix) with ESMTP id 9E8DE207053B for <mailman@OUR.DOMAIN>; Tue, 1 Feb 2022 07:10:51 -0800 (PST)
DKIM-Filter: OpenDKIM Filter v2.11.0 SMTP-SERVER.OUR.DOMAIN 9E8DE207053B
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=OUR.DOMAIN; s=unixmail; t=**********; bh=*******************************************=; h=Subject:From:To:Date:List-Id:List-Help:List-Owner:List-Subscribe: List-Unsubscribe:From; b=*****************************************************************
****************************************=
Received: from SMTP-SERVER.OUR.DOMAIN (SMTP-SERVER.OUR.DOMAIN [6.7.8.9]) by MAILMAN-SERVER.OUR.DOMAIN (Postfix) with ESMTP id B138C1A288F for <OURLIST-owner@lists.OUR.DOMAIN>; Tue, 1 Feb 2022 07:10:49 -0800 (PST)
The above is where the change occurs. The message is received by Postfix
at MAILMAN-SERVER.OUR.DOMAIN for OURLIST-owner@lists.OUR.DOMAIN. Then a
DKIM signature is added, presumably by DKIM-Filter: OpenDKIM Filter v2.11.0 working on Postfix queue ID 9E8DE207053B on
SMTP-SERVER.OUR.DOMAIN which is the message received from [172.17.0.2] (ec2-12-34-56-78.us-west-2.compute.amazonaws.com [12.34.56.78]) with
destination mailman@OUR.DOMAIN.
It appears to me that the message is somehow relayed from
SMTP-SERVER.OUR.DOMAIN to SMTP-SERVER.OUR.DOMAIN via
(ec2-12-34-56-78.us-west-2.compute.amazonaws.com [12.34.56.78]) and
that that's where the change in recipient occurs.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan