Mail server rekeyed
Our key expired and has been replaced
The keys that protect our mail server expired and were regenerated last night. If you send or receive email through us you will probably get security warnings as your mail client notices the key has changed and suspects foul play might be happening. Nope, it has just been ten years since we generated that key. All you should have to do is accept the new one.
We have seen problems today with Thunderbird though, it just fails with a cryptic "Can't send...." message that isn't helpful at all. Go to Edit/Preferences/Advanced/View Certificates and locate all that say mail.beau.org and delete them. Try sending and receiving again and you will be given the opportunity to trust them and to remember the decision.