Hi,
I've spent the weekend writing a filter for the Courier-MTA that parse down MIME-headers and looks for suspect file-attachments.
The filter performs a strict syntax-parsing on the mail-header, and I've noticed that sometimes the "Return-Path" header-name is prefixed with a '>' character (as illustrated in the header below). Is this done by the Courier-MTA, or are these headers received like this?
This is done by Courier. Courier inserts its own Return-Path: header on locally-delivered mail, that contains the envelope return address.
If the message already has an existing Return-Path: header, it will get prefixed by the > character.
pgp00000.pgp
Description: PGP signature
