# File lib/mail/network/delivery_methods/exim.rb, line 5
    def deliver!(mail)
      envelope_from = mail.return_path || mail.sender || mail.from_addrs.first
      return_path = "-f \"#{envelope_from.to_s.shellescape}\"" if envelope_from
      arguments = [settings[:arguments], return_path].compact.join(" ")
      self.class.call(settings[:location], arguments, mail)
    end