Email deliverability checklist

Use this when mail goes to spam, is delayed, or is rejected.

On every domain that sends mail

1. Repair SPF and DKIM in Email Deliverability.
2. Add a monitoring DMARC record (p=none) then tighten later.
3. Send with the same domain in From: as your authenticated domain.
4. Use secure client settings (IMAP 993, SMTP 465/587) — #370.
5. Check StopSpam quarantine for false positives.
6. Avoid spammy link shorteners and huge attachment blasts from shared hosting — use a proper ESP for newsletters when volume grows.
7. Confirm the mailbox password wasn’t changed on only one device.

Still failing?

Include in your ticket: sending address, receiving address, approximate time (PT), whether webmail send works, and the bounce message or headers.