[Mailman-Users] DKIM signing issue - relaying mailman e-mails from third party sources
dlugasny at protonmail.com
Wed Oct 11 04:23:31 EDT 2017
Hallo Mark, Kolleagues,
maybe somebody will be able to help me here.
I would like to relay (also check with Antivir and sign them with DKIM) all Mailman e-mails from our external partners to our final customers. Relaying seems to work nice but we have a problem with DKIM authentication and Return-Path.
Mailman server needs to stay by external partners with old domains and needs to receive bounces. My SMTP gateway is only responsible for receiving and sending e-mails out from the all mailman instances.
The problem is that we are sending an E-mail which looks as follow:
From: campaign at myserver.com
Return-Path: mailman-bounces at external-company.com
The problem is that DKIM check on the gmail server server (and all others) returning error:
[...mailman-bounces at external-company.com](mailto:mailman-bounces at external-company.com) does not designate xx.xx.xx.xx as permitted sender
How to solve that issue ? At the moment we have a DKIM key only for myserver.com. Why DKIM check checking Return-Path and not From address ?
Could You please help here how to manage that issue ? We simply would like to forward all messages from the external mailman instances installed on the different domains to the final customers using our sender domain [myserver.com.](mailto:campaign at myserver.com)
I will appreciate any feedback from Your side.
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