The name on the security certificate is invalid or does not match the name of the target site webmail.domain.com. Outlook is unable to connect to the proxy Server ...

Security certificates are used for a range of purposes. Among these include identity verification, file encryption, Web authentication, email security and software signature checking. Every ...

It is the very first thing you must do. If Outlook fetches an incorrect certificate, you will keep seeing this error. Therefore, click on the View Certificate button ...