Cisco spam filter mistakenly blocked thousands of legitimate emails

An expired Cisco domain has caused thousands of legitimate emails to be erroneously labelled as spam, preventing them from leaving the outbox.

According to a new report from Bleeping Computer, the issue relates to Cisco’s email spam filter, SpamCop, which provides a Real-time Blackhole List (RBL) that mail servers use to determine if incoming mail is spam or not.

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