Hello there Vmars316. We have read your message. We try to help you. It looks like the configuration of your Smtp setting for outgoing mail are not doing well. Check all of the settings that are filled in. I can send you a form with more detailed information about this issue you are having with this software of Thunderbird. I can send you this right away online. Follow the instructions on these forms https://support.mozilla.org/en-US/kb/manual-account-configuration https://support.mozilla.org/en-US/kb/cannot-send-messages If this forms not solve any issue . Send me a screenshot of your settings. https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem Greetings Firefox volunteer.