Rated 5 out of 5 stars

per Jakob el gen. 20, 2014 · enllaç permanent

I normally want to send plain text. But when I answer HTML mails that looks ugly. So I use this add-on with the "Auto-Detect" option. Perfect!

If one want to send plain text with "format=flowed", one have to set the following Thunderbird setting to true:
mailnews.send_plaintext_flowed