https://support.mozilla.org/en-US/kb/ask-tb#w_how-to-ask-your-question

my e-mail is not working. I can't send it to anyone. dennis

Please post the requested information. Then, when you have posted it, tell us the error message you get when you try to send...word for word.

Answer each question:

1. Does thunderbird open?
2. Can you see your folderPane on the left with account name and folders?
3. When you select a folder, do you see a list of emails?
4. When you select an email in the list, can you read it?
5. when you want to send an email, you click on Write and enter the headers and composition and then click on 'Send', what error message do you get...word for word?