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Thunderbird suddenly won't send email.

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I compose a message in TB then try to send. It hangs up on the "Sending" message bar and never completes. It worked yesterday. Windows 10 update last night now it does not work. Coincidence?

I compose a message in TB then try to send. It hangs up on the "Sending" message bar and never completes. It worked yesterday. Windows 10 update last night now it does not work. Coincidence?

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Hello,

Please follow the steps as provided in this Knowledge Base article https://support.mozilla.org/en-US/kb/cannot-send-messages and let us know if this solved your problem.