[MM3-users] Re: How to let mailman log every single email that it sends out?

Jens Günther writes:

I actually also see them without special settings. Postfix should log all outgoing connections and whether the mail has been sent or not, obviously. Regards.

I think what Mohsen is seeing is SMTP batching where multiple RCPT TOs are sent for one DATA. Any personalization will force individual SMTP transactions, although they may be pipelined for each remote MX.

Mark's suggestion of VERP is the best of course because (as much as is possible) it gives the most information about returned emails as well as delivered emails.