When you highlight a message and go to PopMan-->File-->Source OR right-click a message-->Source, IMAP protocol have headers that contain Return-Path: <blowjoe> but in PoP (Point of Presence, aka Post Office Protocol) protocol there's no header like IMAP "Return-Path:"
It is possible to incorporate or include in your next Beta version the Source dialog "Return-Path:" in PoP like IMAP? OR this only apply to IMAP.
I'm not sure that I understand you correctly, but when you display the source of a message, PopMan simply shows the source that has been retrieved from the mail server. It does not hide certain headers.
Btw, I have the header "Return-Path:" in mails from POP3 servers too.
The "Return-Path:" header is set by the sender of an email. So it doesn't matter if you retrieve it from POP3 or IMAP server.
The "Return-Path:" address is used by the receiving mailserver to send an error notification, e.g. if the destination address of the mail does not exist or the mailbox is full.
The "Reply-To:" address is used by the receiver of the message when replying.
Most of the time these two addresses will be identical, of course.
