Incorrect target name/Security Certificate

Incorrect target name/Security Certificate

Every time I sigh into Outlook I get an "Internet Security Warning" stating that the server that I am using has a security certificate that cannot be verified and that the target name is incorrect. I have followed the steps to automatically determine the certificate and install the correct but it just does not work and I keep getting the warning at log-in. I can continue to ignore the warning and use email with no problems but the warning continues to pop up every so often.
How can I fix this problem?