Suddenly cannot send emails
Suddenly Thunderbird will not send emails from one of my computers. Nothing in my configuration has changed. I compose an email, and when I click 'Send' nothing happens except that the menu bar and button strip at the top of the 'Write:' window turn gray.
I can receive emails with no problem. I have another computer with Thunderbird installed and the same accounts on it, and that PC is able to send without any problem. Today is the first day that I have noticed this issue.
When I then close the 'Write:' window I am asked if I want to save the email as a Draft.
Windows 10 Home Version 22HS Build 19045.5011 Thunderbird Version 128.3.3esr (64-bit)
Solution choisie
Turns out it was the 'Cardbook' extension. Deleted it and the issue was resolved.
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Exact same problem here.
I followed all the tips on this page to try and solve this very frustrating issue https://support.mozilla.org/en-US/kb/cannot-send-messages (including deleted my email accounts and re-installing them; including uninstalling Thunderbird before installing it again). Nothing works. Sending email from my email provider accounts works like a charm, so there's not doubt the issue is wih Thunderbird and not related, at least in my situation, to SMTP issues. Thanks.
Solution choisie
Turns out it was the 'Cardbook' extension. Deleted it and the issue was resolved.
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