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The daily spam to my Hotmail-account today contained a message with a forged sender addresssuspicious enough for me to check the SMTP header.
The only "Received" entry was:
Received: from grogrol ([192.184.84.162]) by COL0-MC4-F51.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
Mon, 12 May 2014 13:43:36 -0700
What kind of hostname is "grogol" ? A DNS lookup does not find any name. Could it be a local hostname known to the SMTPSVC server?
The message ID was:
Message-Id: <E1Wjx4R-0007I1-Kz@grogrol>
Is that where SMTPSVC got "grogol" from?