changes.mady.by.user Unknown User (espenme)
Saved on 27.02.2017
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http://searchexchange.techtarget.com/definition/ESMTP
http://searchexchange.techtarget.com/tutorial/Part-3-How-Extended-SMTP-works-and-common-ESMTP-commands
https://www.kutukupret.com/2009/09/09/extended-smtp/