Email // updated 2026-07-22
Troubleshoot email delivery
Mail going to spam? Bouncing? Missing? Diagnose in this order.
- Check MX with dig MX yourdomain.com. It must point to the mail host.
- Verify SPF has the correct include and ends in -all or ~all.
- Confirm DKIM signature validates (send a test to check-auth@verifier.port25.com).
- Check DMARC — start at p=none while you monitor.
- Look at the mail headers for Received-SPF, Authentication-Results.
- If bouncing, read the full bounce — it names the receiver’s exact reason.
warn
If your IP shows up on a blacklist, don’t request delisting until you’ve fixed the actual issue (compromised mailbox, missing DMARC, high complaint rate).
Still stuck? Our engineers answer the phone 24/7 — (480) 624-2500.
