@girish I gather one can do this through postfix configuration.
I have to admit we haven't done this ourselves. It is one of the reasons we actually want to transition to something like Cloudron or poste.io or mailcow or similar so we can actually control such things.
The email setup in Cloudron is really nice and so I think will take a lot less maintenance going forward.
I gather that this can be done in postfix. Here are some relevant links:
- How to BCC all outgoing mail from one local mailbox to the other one in the same domain
In the end we would also like to get this going with Mailman. The problem with just distribution lists is often I will want to send a message to someone and cc a distribution list and then if that person is on the distribution list they will receive it twice. Eg consider sending a message to firstname.lastname@example.org cc: email@example.com. Then jim will get the message twice. With Mailman we can stop this from happening and also have an archive of firstname.lastname@example.org, etc.