You may see an error like the following while setting up an email account, or checking your email.
"Cannot Verify Server Identity" - The identity of "mail.example.com" cannot be verified.
This can happen if the SSL received when connecting to the domain in question does not match that domain, or is expired or otherwise invalid.
You will need to resolve the underlying issue with the SSL for the domain.
If the domain's SSL was purchased through cPanel, but has expired, the following article describes how to renew it.
If the SSL is provided by AutoSSL, the following article describes how to attempt a renewal of the SSL.
If the SSL is provided by a 3rd party, you will need to ensure it is valid and installed.