How does Yahoo Mail's spam filtering work?

Yahoo's spam filtering operates across several layers, combining technical checks with behavioral signals.

Connection-level filtering evaluates sending IPs against Yahoo's reputation databases. Known spam sources face immediate rejection. Unknown sources face cautious treatment.

Content filtering scans messages for spam characteristics using machine learning and pattern matching. Yahoo detects known spam campaigns through content fingerprinting.

Authentication requirements are strict for bulk senders. SPF, DKIM, and DMARC must pass. Yahoo was a founding participant in DMARC development.

User feedback through spam reports directly influences filtering. Yahoo's Complaint Feedback Loop provides this data to senders, and the same data feeds their filter decisions.

Yahoo's filter weighs trust earned through authentication and maintained through positive user response.

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