Thunderbird will not reinstall clean
It began with thunderbird would not send messages. It can receive messages and the password is correct. I have checked the server settings, reset the passwords, deleted passwords, changed passwords, and gone through the entire FAQ several time. I even removed the mail account and set it up new. So I have now resorted to backing up the profile and then removing Thunderbird from the computer to see if a clean install and set up will fix the problem. Now when I reinstall thunderbird it automatically migrates the old profile into the thunderbird install so there is no way for me to start from scratch. Is there a fix for the email that will not send? I am out of ideas!
Chosen solution
For the midrivers account, the server is smtps.midrivers.com on port 587, STARTTLS security, normal password authentication, and the User name is the part of your address before @. If that doesn't work, try SSL/TLS security on port 465.
For account 4, smtpout.secureserver.net on port 80 or 3535, Connection security = none, authentication = password, transmitted insecurely, User name = your full email address. See also the note about activating smtp relay.
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Create a new profile using Profile Manager. Then start Thunderbird with the new profile. https://support.mozilla.org/en-US/kb/using-multiple-profiles
It would help if you indicated your mail service and settings, or the error message you see when sending. Select Help/Troubleshooting Information, click 'Copy text to clipboard', then paste it in a reply here, omitting all the data after and including the Graphics section.
To test with a new profile, start Profile Manager by pressing Winkey+R, and type thunderbird.exe -p Set up the account from File/New/Existing Mail Account and see if sending works. You can then transfer data from the old profile to the new one if desired.
click the link for the pdf with the information
Modified by JuliaLN
Chosen Solution
For the midrivers account, the server is smtps.midrivers.com on port 587, STARTTLS security, normal password authentication, and the User name is the part of your address before @. If that doesn't work, try SSL/TLS security on port 465.
For account 4, smtpout.secureserver.net on port 80 or 3535, Connection security = none, authentication = password, transmitted insecurely, User name = your full email address. See also the note about activating smtp relay.
Modified by sfhowes