What are Yahoo’s bulk sender requirements (2024)?

Yahoo's 2024 bulk sender requirements mirror Gmail's guidelines with some specific emphases. Bulk senders (those sending to Yahoo addresses at scale) must implement SPF, DKIM, and DMARC authentication with proper alignment. One click unsubscribe via List-Unsubscribe headers is mandatory.

Yahoo enforces strict complaint rate thresholds, requiring senders to maintain rates below 0.3%. Unlike Gmail's phased approach, Yahoo has been enforcing these standards more quietly but consistently. Messages failing authentication face rejection or aggressive filtering.

The requirements also include valid reverse DNS for sending IPs and TLS encryption for transmission. Yahoo monitors these signals continuously, adjusting filtering based on compliance. Non compliant senders experience increased spam filtering and potential rejection during high volume periods.

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