Original Title: "Outlook for mac 2011"

I have configured my emails and get a green light, presumably, indicating that my email accounts have been set up properly and are working. However, I am only able to receive emails and not send them. When Outlook first opens I get the following pop up message:

A failure occurred during certificates trust verifications. Please specify the trust settings for the certificates that need updating. If you continue, the information that you view and send will be encrypted, but will not be secure.

Any suggestions on how to fix this?