Description
From Mastering Microsoft Exchange Server 2013 By: David Elfassy Publisher: Sybex Pub. Date: November 18, 2013 Web ISBN-10: 1-118-55683-6
From Pro Exchange Server 2013 Administration By: Jaap Wesselius Publisher: Apress Pub. Date: December 19, 2013
Spfwizard.net
https://mxtoolbox.com/EmailHeaders.aspx
https://spamcheck.postmarkapp.com/
https://mailheader.org/
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