Email Troubleshooting guide

Use these checks to identify whether an email problem affects one device, one mailbox or delivery to a particular recipient.

Check service status and Webmail first

Check Network Status, which requires the client-portal login, then follow the secure Webmail guide. Compare Webmail with the affected app. A working Webmail login helps separate an app-configuration problem from a mailbox-access problem, but does not prove every delivery path works.

Cannot sign in

Use the full email address and that mailbox’s password. If you manage cPanel, check Email Accounts for the address and its login restrictions. If a password has changed, update the devices that use it. Avoid repeated guesses; contact support if the correct credentials still fail. No fixed password-change waiting period is promised.

Cannot send

Follow Cannot send emails. Check SMTP authentication, the account-specific server, matching port and encryption, and the full error message.

Cannot receive or messages are missing

Check Webmail, Junk/Spam, deleted items, any rules and forwarding you use, and the sender’s delivery-failure notice. In cPanel, check Email Accounts storage and receiving restrictions. Track Delivery can help you compare the recipient, time and result. A blank report is not proof that a sender never sent a message.

Mailbox full

Review used and allocated storage in Email Accounts. Preserve important mail before deleting anything. Moving messages to a server-synchronised Archive folder does not free the mailbox’s storage. Ask support about capacity if you cannot safely clear space.

Only one app or network fails

Compare its settings with the email server settings guide. Check connectivity on a trusted alternative connection where appropriate. Keep antivirus and firewall protections enabled; ask your IT administrator to investigate blocked connections.

Spam or suspicious messages

See the spam-filter guide. Do not open unexpected attachments or use links in a suspicious message to enter credentials.

For support, record the affected address, app and version, time and timezone, exact error, and whether Webmail is affected. Remove unrelated personal information from screenshots.

Need assistance? Contact Rhino Hosting Support. Include the relevant error and application version, but never send your password.

Content reviewed: 29 September 2026. Controls checked in cPanel 138.0.10, Jupiter. Account-changing actions were not performed for this guide.