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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:  

  But the call to action link was a bit.ly URL. Following the clickthroughs, the bit.ly URL redirected to linksynergy.com, which in […]

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