Thunderbird changes the content of the received message to a strange sequence of letters and characters and numbers.
Thunderbird changes the content of the received message to a strange sequence of letters and characters and numbers. The same problem occurs with selected messages, some messages but the text is always the same
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I wish I has 10 cents for every post about this that I have seen in the last decade. I would be a multi millionaire. Like this one https://support.mozilla.org/en-US/questions/1459223
Right click the folder, select properties and then the repair button.