When a message is sent and received by the recipients Email system, there are duplicate From fields in the Email. This causes bounces with some Email systems which reject Emails with duplicate From fields as coming from a spammer. When viewing the message properties in the sent folder, there is only one From field. Below is part of the header information from sending a test message to my Internet mail account; note the duplicate From field.
Subject: Test
X-DueDateTime:
Date: Thu, 29 Sep 2011 08:19:34 -0400
From: [sender name removed]@[domain name removed].com
Reply-To: [sender name removed]@[domain name removed].com
From: [sender name removed]@[domain name removed].com
Message-ID: <OF852575B3.0069B0A3-ON8525791A.00439159@[domain name removed].com>
X-MIMETrack: Serialize by Router on [smtp server name removed](Release 8.5|December 05, 2008) at
09/29/2011 08:19:34 AM
MIME-Version: 1.0
Content-Type: text/plain;
charset="US-ASCII"<br/>
Content-Length: 348