Non Standard Headers Key:
| Header Name | System that added it |
| X-pstn* | Postini |
| X-SmarterMail* | SmarterMail |
| X-NAS* | Norton Anti-Spam |
| X-MSMail* | Microsoft Outlook |
| X-Barracuda* | Barracuda Filtering Server |
| X-TM-AS* | ScanMail™ Suite for Microsoft™ Exchange |
| X-AOL* | America On Line (AOL) |
| X-Antivirus* | Avast! |
| X-MD* | MDaemon® Email Server |
| X-AntiAbuse* | Exim and sometimes PHP mail scripts |
| X-YMail* | Yahoo Mail |
| x-job* | ExactTarget Email Marketing |
| X-PCTools* | PC Tools Mime Parser |
| X-Mail-Filter-Gateway* | MailScanner |
| X-IMSS* | Trend Micro InterScan Messaging Security Suite |
| X-Facebook* | |
| X-IronPort* | Cisco IronPort Email Security Services |
| X-dmid* | dotMailer® |
This is just a point of reference, as I hate to Google them. If you add ones to add, let me know. I am purposefully excluding mailer, priority, and mimeole.
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