Can refer to either the Mozilla project or Mozilla Foundation. They produce a variety of software including Firefox and Thunderbird; thus, questions about a particular Mozilla program (versus the organization itself) should use a more specific tag.

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Thunderbird won't send email

Out of sudden, my Thunderbird stopped sending e-mails. When I click the send button, nothing happens. The send button does absolutely nothing. No error messages whatsoever. It's like it doesn't even ...