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A unique identity matching the From address not found
I am using Thunderbird 91.4.0 on Windows 10. Since this upgrade any email in my inbox when opened has the "A unique identity matching the From address not found" message… (read more)
I am using Thunderbird 91.4.0 on Windows 10. Since this upgrade any email in my inbox when opened has the "A unique identity matching the From address not found" message across the bottom, red 'table indicator' boxes in various places around the message. The links in the email do not link, they bring up a box with various information including the link address. Reply-to shows the sender's address and To field shows my address. Reply, forward, delete buttons are missing. If I move the arriving email to another folder it looks normal, but if I hit 'reply' it gets all weird as above again. I saw that this was a bug a couple of years ago with a version about 20 versions back. What's going on? And more to the point, how can I fix it?
Thank you for any help that you can offer.