Fixing Yahoo "554 5.7.9 Message not accepted for policy reasons"

Yahoo, AOL and Verizon Media addresses reject with:

554 5.7.9 Message not accepted for policy reasons.
  See https://postmaster.yahooinc.com/error-codes

Since February 2024, Yahoo enforces the same bulk-sender requirements as Google: authenticated mail (SPF and DKIM aligned under DMARC), one-click unsubscribe on marketing mail, and spam complaint rates kept under 0.3%.

Why it happens

Usually one of: no DMARC record at all, DKIM not aligned with the From: domain, missing List-Unsubscribe /List-Unsubscribe-Post headers on bulk mail, or a complaint rate that tipped past the threshold and triggered policy filtering.

Diagnose it

The compliance check below grades your domain against the shared Google/Yahoo rubric: SPF, DKIM, DMARC presence and policy, and the DNS-verifiable pieces of the bulk-sender rules — so you can see exactly which requirement is unmet.

Fix it

1. Publish DMARC (start at p=none with a rua= address, then move to quarantine).

2. Ensure DKIM signs with your From: domain and SPF authorizes the sending host — both must align.

3. Add RFC 8058 one-click unsubscribe to every marketing message.

4. Enroll in Yahoo's Complaint Feedback Loop and prune unengaged recipients to drop complaints.