Thunderbird automatically updated last night and now I can't send email from any of my accounts. All incoming works just fine. Unlike some of the others I've read, my address book seems just fine. The only problem is that the server is rejecting all of my email accounts now. I have made zero changes. I have since tried working with the tech support for Shaw and they're stumped and referred me here. Here's the error message with my email addy removed: Sending of the message failed. An error occurred while sending mail. The mail server responded: <email addy was here> sender rejected. Please verify that your email address is correct in your account settings and try again. I tried creating a new outgoing server using the info from the tech support person and making that the default, but the exact same problem occurred. HELP please!