938185d2_adability_in_your_mail_headers__Explanation
[Header] Originating e-mail [Matching RegEx] |^X\-Originating\-Email:(.*)|mi [Explanation] 
Another representation of the sender of the email. Some mailers add this as a precaution against those who spoof the "From:" line.
Extended Mail Header Parser - Readability in your mail headers
Explanation