This usually means your mail client is using your domain name as the server while the SSL certificate is issued for a different hostname. The fix is to use the server's correct secure hostname.
- Open cPanel, go to Email Accounts, click Connect Devices, and note the exact secure incoming and outgoing server names shown there.
- In your mail client, set both incoming and outgoing servers to
mail.yourdomain.com(or the exact name listed). - Use SSL/TLS with IMAP port 993 and SMTP port 465.
Make sure AutoSSL has issued a certificate for your mail hostname; new domains may need a short wait. If the error persists after using the listed server name, please open a ticket with a screenshot of the error.
