You are here with Thunderbird. Hello there garyandlinda1 We have read your message. We try to help you. Look for sending out messages Smtp. https://support.mozilla.org/en-US/kb/cannot-send-messages https://support.mozilla.org/en-US/kb/manual-account-configuration Updates Can changes form fields in your settings. Did you had one? Check this settings and look if they are in correct place. If it could be that your ip address is on a global blacklist.(or internal) Then you will have to inform your provider how this will proceed and obtain permission after consultation to continue on the internet. https://mxtoolbox.com/blacklists.aspx (Scanned) Greetings Firefox volunteer.