> you only use should no_address_mappings if your mail loops back, not > generally - you usually want alias expantion, canonical mapping, and > automatic BCC (at least if you configure any of those).
Sorry, I don't follow you. I'm on debian. As far as I can gather, all mail related activity is logged in /var/log/mail.log. Is that log all I need to help determine where the duplicate emails are coming from? If so I can study that and probably figure this out.
