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Thunderbird refuses to download emails

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Since updating to Thunderbird 78 my emails refuse to download. If I uninstall and reinstall, after a restart, it works until I close Thunderbird, and then it refuses to work again. I have also had trouble sending messages. I'm using Norton antivirus software. Thunderbird used to be a great reliable product, but now it is totally unreliable.

Since updating to Thunderbird 78 my emails refuse to download. If I uninstall and reinstall, after a restart, it works until I close Thunderbird, and then it refuses to work again. I have also had trouble sending messages. I'm using Norton antivirus software. Thunderbird used to be a great reliable product, but now it is totally unreliable.

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Does this topic offer any solutions?

https://support.mozilla.org/en-US/questions/1336858