Can someone tell me when and why a client, MTA relay, Unix .Forward, anonymous relay, or listserver will create, or alter these headers: Resent-Sender: Resent-From: Sender: From: If you can please ...
I have a postfix mailserver running. Mails sent from users to Gmail are showing up in Gmail, so it works in general. Same for all other freemail hosts I know. The problem is that some users have no ...