Use the mailbox settings issued for your account. Mailbox authentication and successful external delivery are separate checks.
Before you start
Use the access and features actually assigned to your account. Keep a rollback or recovery route before changing existing service settings.
Steps
- Confirm the mailbox exists and obtain its exact server names and encrypted connection settings.
- Configure the client using those settings and a dedicated supported credential.
- Check that folders and Sent behavior are correct without copying private mail into diagnostics.
- Send a deliberately non-sensitive test only to a consenting recipient, then confirm reply delivery.
Verify the result
Both directions arrive in the intended mailboxes. A successful login or empty mail queue alone does not establish deliverability.
Help and related information
Contact support, service status, and Customer Access. Never send passwords or recovery codes.
Official cPanel documentation. Account features vary by hosting package.