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I've installed 2.0.1 on Windows 7 and Thunderbird 3.0.4. When sending mail, an error like "Temporary file cannot be opened, check Temporary directory preference". The second time Send button is pressed, there's no error.

Это отзыв для предыдущей версии этого дополнения (2.0.1). 

I'm not sure what's causing that, or how to fix it, but I do know about it. Try the beta channel version and let me know if there's any improvement.