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McColo shutdown not felt the same by all recipients

Mailbox-level reduction may depend on spam detection methods.
Mailbox-level reduction may depend on spam detection methods. When the rogue provider McColo was taken offline in November 2008, depriving many botnets of their command and control… https://www.virusbulletin.com/blog/2009/07/mccolo-shutdown-not-felt-same-all-recipients/

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