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Getting a “mail certificate name mismatch” / “cannot verify server identity” error?

This error usually occurs when a mail client is using a secure connection to the mail server under a custom hostname that hasn't been covered by our Free SSL. 

For example, if imap.yourdomain.com is being used to set up mail in a mail client but an SSL hasn't been applied to the hosting package, then our mail servers default *.stackmail.com SSL won't cover the imap.yourdomain.com hostname. This will result in the ”mail certificate name mismatch” / “cannot verify server identity” warning. 

To avoid the certificate warning you can: