Thanks for all the suggestions! I did all that, and still nothing helped. I even reistalled OE 6 and IE 6, which I downloaded from Microsoft, and the problem is STILL there. It's getting even stranger...sometimes when I can't send a message, I change the title of the message by one letter, and the message will send OK!! This problem is not happening in Microsoft Outlook, so it's obviously a problem with Outlook Express ONLY. Getting stranger and stranger......