Mail forwarding fails for SPF domains

[ibennetch]

We forward some mail using mail aliases, this process fails SPF checks because we don't rewrite the message, we only forward it. We should fix this, perhaps by using an SRS plugin.

Related to phpmyadmin/phpmyadmin#12640

[williamdes]

It should not fail anymore for the mailing lists I configured.
https://blog.williamdes.eu/Infrastructure/tutorials/add-a-sender-header-to-mailman-3-posts/
Currently configured:

• dmarc
• git
• test