Spam, campaign statistics and red flag URLs

It’s not often spammers send me their campaign statistics, but on Tuesday¬†one did. The spam came “from” news@udemy.com, used udemy.com in the HELO and message-ids and, sure enough, was advertising udemy.com:   Received: from udemy.com (unknown []) by ... From: Udemy <news@udemy.com> Subject: The Photoshop Secret - Master Adobe Photoshop like a Pro...

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