> That should work. I have the same configuration and no problems with posting UTF-8 messages.
>
>   FB>      Exactly. That started to happen after the latest TB upgrade for
>   FB> Mac.
>
>   FB>      I checked other news clients and it worked fine...
>
> Looks like this 'feature' has been introduced by Firefox:
>
> https://old.reddit.com/r/Thunderbird/comments/ps6gxp/is_text_encoding_options_gone/
>
> I haven't used the newer Thunderbird versions. Does it always use UTF-8 even if the text in the mail is only 7-bit ASCII?

I have the newest TB in this computer. This always posts UTF-8. :(

However, if the message is plain 7 bit ascii, the CHRS kludge really doesn't matter. ;)

'Tommi

--- Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1