Why does my email show the sender as - On Behalf Of ?
Some email readers, especially Outlook and Outlook Express will show a different value in the From: header, than what was sent. This happens when the From and To email addresses are different (which is most of the time).
From: firstname.lastname@example.org On Behalf Of John Doe
The From: header is set to the sender of the message. That is, the person who sent the message
In the above example, JohnDoe@example.com
The Return-Path: header is set to the address of the mailing list
In the above example, email@example.com
Outlook is warning their reader that those two fields have conflicting values, and showing both values
If the From and To email headers have the same email address
Because of DMARC, the From header is modified to be the mailling list address, instead of the actual author's email address.
Outlook will not show the "Friendly Name" from the email header
Instead, it shows just email address that was in angle brackets <firstname.lastname@example.org>
Mail-List.com will then insert an extra line at the top of the email
This message was sent by JohnDoe@example.com