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Troubleshooting

Mail arrives in spam despite passing authentication

Why authenticated mail can still land in spam and what to check next.

Published: 2026-05-01Last reviewed: 2026-05-19

Implementation checklist

  1. Confirm SPF, DKIM, and DMARC pass for the filtered message.
  2. Compare subject/body against providers' bulk mail guidance.
  3. Reduce sudden send-volume spikes where possible.
  4. Check organization-level allowlists and quarantine policy.
  5. Ask IT/admin to review mailbox-side rules and reputation signals.

Why this still happens

Authentication verifies sender identity, but inbox placement also depends on trust and engagement signals.

If filtering continues

Coordinate with your mail administrator to adjust sender trust settings and monitor changes after each adjustment.

FAQ

Can mail still land in junk if SPF, DKIM, and DMARC pass?
Yes. Mailbox providers weigh reputation, engagement, content signals, and organizational filters beyond authentication results alone.
What should I check first when a message is filtered?
Start with sender reputation and mailbox rules, then review message headers to confirm authentication and filtering clues.

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