quoted_printable

# File actionmailer/lib/action_mailer/quoting.rb, line 5
    def quoted_printable(text, charset)
      text = text.gsub( /[^a-z ]/i ) { quoted_printable_encode($&) }.
                  gsub( / /, "_" )
      "=?#{charset}?Q?#{text}?="
    end