How do I verify a message was sent using SSL?

Hello Everyone,

I've just installed an SSL certificate for Mail in Server Admin. When I send messages from the Mail client using SSL, is there a way to verify that it was actually SSL-encrypted? I was hoping I would see a lock icon somewhere in the message, or something similar to the way web browsers display a lock icon when visiting a secure (https) site. The long headers seem to reveal nothing in this regard.

Thanks,
Patrick