When I try to respond to email, I keep getting a request to enter my new password. There is no new password.
When I try to respond or forward email, quite often it asks that I enter new password. The password is saved. When I enter the password it still will not send mail. if I save the email in drafts I usually am able to send it later without entering my password again.
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I take it that you don't have this problem when you sign in to Thunderbird to get your mail -- i.e. it's only when you try to send mail? It's possible that your password is being forgotten or is somehow corrupted. Go to Preferences > Security > Passwords > Saved Passwords and check that the password for the outgoing (SMTP) server is correct. Also check (under Account Settings) that the correct SMTP server is being used for this account. If that's all OK it may be that your connection to the server is being slowed/interrupted from time to time. The fact that the message sends 'later' without any difficulty is significant. If you are on a home or business network, for example, could the times you experience this problem coincide with times of high demand by other users?