I love tThunderbird, but, I get so many "confirm security exemption" messages it is becoming very hard to use. The help desk at the university where I work just says "we do not support that mail system, use the one we like". I would rather not. I am attaching a JPEG of the certificate information. I promise I have looked through your HELP blogs, and cannot find anything that works for me. I would be so happy if you could help me.