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Steps to reproduce:
I can't add email addresses to my local folders in thunderbird? I am running windows 10 & Thunderbird 78.5.1 (64-bit)
I tried to add an email address to one of my local folders.
I have a few rules set up so EG when emails from friends comes into my inbox it automatically goes into a local folder named friends.
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The new email should be added to the relevant local folder.
Existing rules still work IE if I receive an email from an address that is already set up it goes into the relevant local folder.