If you receive the following error:
"ERROR Warning: stream_socket_enable_crypto(): Peer certificateCN=*.yourhostingcompany.com' did not match expected CN=mail.yourdomain.com' in ..."
You are not using the proper server name for your mail server.
In order to resolve this error make sure that the proper server name is used (For Example: the cPanel server name) or the option "Ignore Invalid Mail Server SSL" is enabled under CE Settings >> Mail Configuration.