Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
About this Add-on
https://bugzilla.mozilla.org/show_bug.cgi?id=414299 : Format | Auto-Detect: Messages composed as HTML with <tt> for "fixed width" sections or with simple links get sent as plain text
Note: if You use my other extension, Stationery, You do not need to install this. Stationery already contain this bug-fix.