My only real gripe with ST at the moment :-)-O is that there is no way of formatting indented emails ie
> short line
>> long line 1234567890 1234567890 1234567890 1234567890 1234567890
> short line
which after reformatting (just as example) could look something like
> short line
>> long line 1234567890 1234567890 1234567890 1234567890
>> 1234567890
> short line
in other words reformat long lines or blocks of long lines keeping the indentations intact. The Headers must be untouched, as well as everything after the signature identifier ‘— ‘ (trailing space)
Thunderbird’s (or rather Betterbird’s) Command/Alt-R does a decent but not perfect job, but I like to write in ST and don’t want to switch between them all the time, even when using the external-editor-revived extension which after figuring out the (not too complicated) configuration works amazingly well (tied to Command-E, there is even a button).