Google Calendar Notifications Always go to Spam

I accidentally moved a Google calendar notification to the spam folder 1 time and now I can't get TB to stop putting them in there. I reset the training data and created … (cytajśo wěcej)

I accidentally moved a Google calendar notification to the spam folder 1 time and now I can't get TB to stop putting them in there. I reset the training data and created a message filter to catch them but they still automatically go into my spam folder. How do I get these messages to go to my inbox instead of spam?

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Thunderbird Junk email and spam