Checkpoints
- Verify MX records point to the correct mail provider.
- Confirm the mailbox exists and is not over quota.
- Check whether mail routing is local, remote, or automatic in cPanel.
- Review SPF, DKIM, and DMARC.
- Look for blocks caused by failed login attempts or compromised accounts.
- Review bounce messages for the exact error.
Support tip
Always collect sender, recipient, timestamp with timezone, subject, bounce text, and whether the issue is sending, receiving, or both.
Email troubleshooting essentials
Always separate sending problems from receiving problems. Check DNS, mailbox quota, authentication, spam filtering, mail routing, firewall blocks, and bounce messages before changing random settings.
Quick support handoff
If this article does not solve the issue, open a support ticket with the domain, service name, exact error, time the problem started, and what changed recently.
