Anyone know how to edit this plugin to stop the duplicate header problem. We've narrowed it down through trial and error to something in the actual plugin itself. Seems the code is putting in three headers as it sends it off to the exchange server. Exchange server kicks it out and sends back a Message Not Relayed error with the following complaint:
The message WAS NOT relayed to:
robg@xxx.net:
554 5.6.0 Reject, id=29866-17 - BAD HEADER
Info@xxx.com:
554 5.6.0 Reject, id=29866-17 - BAD HEADER
This nondelivery report was generated by the program amavisd-new at host
xxx.xxx.com. Our internal reference code for your message is
29866-17/EUvhtQ6ZCUxQ
INVALID HEADER
Duplicate header field: "Date"
Duplicate header field: "Message-ID"
Duplicate header field: "MIME-Version"
Return-Path: Info@xxx.com
From: Sender Info@xxx.com
Message-ID: 20120129140655.78207200@www.xxx.com
X-Mailer: WordPress with EMU2 Email Users 2 - PHP5.3.6
Subject: test
Yes I added the "xxx". in place of domain names, email names etc.