Incorrect characters in Yahoo mail using Thunderbird

https://s2.qwant.com/thumbr/0x380/7/b/263b1dede8080ac153d9365b7e7f8e8733a63c5108638d233161c5ebfa452a/yahoo_-1114850.png?u=http%3A%2F%2Fmidia.gruposinos.com.br%2F_midias%2Fpng%2F2015%2F10%2F15%2Fyahoo_-1114850.png&q=0&b=1&p=0&a=1For 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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