IMHO both "> > foo" and ">> foo" are bad, it should be ">> foo".
I achieve this with a Vim script: https://vim.fandom.com/wiki/Correct_format-flowed_email_function
Kurt Hackenberg:
If you propose that software add a space after the rightmost '>', but not after others, I think it's thirty years too late to change that quoting mechanism. You'd have to change all the mail readers in the world, and also RFC 3676. We know that won't happen.
-- ilf If you upload your address book to "the cloud", I don't want to be in it.
