https://support.mozilla.org/en-US/questions/1006626
Code: Select all
Tools > Options > Advanced > General tab Click on Config Editor
In top search type: mailnews.force_charset_override; Value = 'false'
What do you have as the Value..true or false? If Value = 'True', double click on line to toggle to 'false'
close window - top right X click on OK to save changes to Options. Close and reopen Thunderbird.