Spam filtering
cPanel servers may include SpamAssassin, filters, blacklists, and mail routing controls. Tune filtering carefully so real mail is not rejected.
Forwarders
Forwarders send mail from one address to another. Forwarding to free mail providers can harm deliverability if spam is forwarded. A mailbox plus fetch/import is often more reliable than blind forwarding.
Best practice
Use SPF, DKIM, and DMARC, keep mailing lists clean, and never send bulk mail from compromised scripts or shared hosting accounts.
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.
