A bug with Cisco’s SpamCop anti-spam service resulted in thousands of emails being blocked after being mistakenly marked as spam. The problem arose after SpamCop allowed its domain to expire, resulting in mail servers using the service to automatically reject outbound messages.

As a result of the domain’s expiration, thousands of organizations and email administrators around the world discovered that their outgoing emails were listed as spam and blacklisted on bl.spamcop.net. Administrators also encountered the following unhelpful message while checking their mail server logs: “The error on www.spamcop.net is: An error occurred while processing your request.”



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