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Last updated 2018-03-29
Starting around March 25, 2018, I started seeing an unusual amount of bounces from my email server. The emails bouncing were the double-opt-in “please confirm your subscription” messages automatically generated by the WordPress plugin MailPoet. This happens from time to time if, for example, somebody accidentally mis-types their email address. But now, suddenly they were coming in repeatedly for the same handful of addresses, including ones like firstname.lastname@example.org and email@example.com. So out of curiosity I headed over the Linode Status page, and saw this: