I did ask embarqmail support. Was chatting with them for a little while and they say it's nothing on their end and that the problem is on mine.
Here are all of the headers from the message:
-----Original Message-----
From: MAILER-DAEMON@myserver.net [mailto:MAILER-DAEMON@myserver.net]
Sent: Monday, March 02, 2009 12:12 PM
To: library@myserver.net
Subject: failure notice
Hi. This is the qmail-send program at myserver.net.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
<username@embarqmail.com>:
208.47.184.2 failed after I sent the message.
Remote host said: 550 5.6.0 Invalid header found (see RFC2822 section 3.6)
--- Below this line is a copy of the message.
Return-Path: <library@myserver.net>
Received: (qmail 2700 invoked by uid 453); 2 Mar 2009 17:11:36 -0000
X-Virus-Checked: Checked by ClamAV on myserver.net
From: "Library" <library@myserver.net>
To: <dbake@myserver.net>,
<username@embarqmail.com>
Subject: FW: children's librarian and special programs coordinator
Date: Mon, 2 Mar 2009 12:23:10 -0500
Message-ID: <000001c99b5b$8fd526d0$949ebb83@xxxx.myserver.net>
MIME-Version: 1.0
X-Mailer: Microsoft Office Outlook 11
Thread-Index: AcmZNqyctYcu5MEGRVSdlXyoGFpuFACJMikg
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3350
Content-type: multipart/mixed; boundary="----------=_1236013896-2695-0"
X-Qpsmtp-Disclaimer: myserver.net
: myserver.net
Thanks for the help.