When I restarted Thunderbird today, it automatically upgraded itself to version 78.4.0 (32-bit). Unfortunately, I am now UNABLE TO SEND MESSAGES. When I hit Send, a box pops up with the following message: Send Message Error Sending of the message failed. Peer using unsupported version of security protocol. The configuration related to outbox.whoi.edu must be corrected. I have checked my outbox.whoi.edu configuration, and it is set correctly as follows: SMTP Server Settings Description: Server Name: outbox.whoi.edu Port: 587 Default: 587 Security and Authentication Connection security: STARTTLS Authentication method: Normal password User Name: lmartin Can you please help me to restore the functionality of my email, so that I can send messages once again? Thank you.