For the last weeks/months, I had issues when sending email through my Yahoo mailbox, using Thunderbird…
Not through other mailbox providers
Not using Yahoo webmail

Symptom: UTF-8 incorrect handling. Strange characters (%?…) in the mail body…

Why ?
Not sure why, but something went wrong on Yahoo side (SMTP servers config I guess)

How to solve it ?
Here are my findings (tested on Windows and on Linux)
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