Hi List,
I am running a mailing list server using the ListServ software. List
members can send a message to a list, and the software essentially
forwards the message to the entire list, using the following headers:
Sender: <The local list mail address>
From: <The mail address of the original sender of the message>
I use my own Postfix implementation as SMTP server to send the forwarded
message.
DMARC is increasingly causing problems for my list users, because the
"From:" sender does not match the sending server (which is my own
server).
One way to mitigate this problem would be to use the list address in
"From:". But the ListServ software does not support this.
My question: Is it possible to configure Postfix to replace the address
in the "From:" header with the value in the "Sender:" header?
If possible, the replacement should preferably be done for specific
values in the "Sender:" header, so it will not be implemented for all my
lists at the same time.
Kind regards,
Lucas
