Yahoo aligned its bulk sender requirements with Google in February 2024. The rules apply to any domain sending more than 5,000 messages per day to Yahoo or AOL addresses. The authentication requirements are identical to Gmail’s — which is deliberate. If you’re compliant with Google, you’re compliant with Yahoo.
Requirements
SPF
Your SPF record must include every IP or service sending on behalf of your domain. Yahoo performs an alignment check: the domain in the From: header must align with the domain in the SPF record that passes.
DKIM
Every message must carry a DKIM signature. The signing domain must align with the From: domain — either an exact match or a subdomain of it.
DMARC
A DMARC record is required with a policy of at least p=quarantine. Unlike SPF and DKIM, which are checks, DMARC is a policy declaration that tells Yahoo what to do with mail that fails authentication.
Spam complaint rate
Yahoo uses a complaint rate threshold similar to Google’s. The published cap is 0.30%, with the recommendation to stay below 0.10% to avoid deliverability impact.
One-click unsubscribe
Yahoo requires the same List-Unsubscribe and List-Unsubscribe-Post headers as Gmail for marketing email. Transactional messages are exempt.
WordPress context
Yahoo’s requirements are downstream of your general authentication setup. If you’ve set up SPF, DKIM, and DMARC for Gmail compliance, Yahoo is already covered.
The only WordPress-specific point: ensure the From: email address in your mailer plugin uses your domain, not a generic address like wordpress@ or a provider address. DMARC alignment fails when the From domain doesn’t match the signing domain.
In WP Mail SMTP and FluentSMTP, this is the From Email setting. It must be an address at the domain whose DKIM record you’ve published.
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