Vincent Pelletier:
> Hello,
>
> I have a Mailman + postfix setup (old versions: mailman 2.1.11,
> postfix 2.5.5), and the mail server of one of subscribers' domain
> started rejecting mails when "From" header domain is its own domain
> (foo.com MX rejecting incoming @foo.com mails). This of course happens
> when a @foo.com member posts to the list: other @foo.com subscribers
> never receive his post.
I suspect that they are enforcing a DMARC policy that requires
modifications to list managers so that they replace the From: header
address with the sender address of the mailing list.
Google for "dmarc mailman fix".
Wietse
