# File lib/mail/network/delivery_methods/sendmail.rb, line 46
    def deliver!(mail)
      envelope_from = mail.return_path || mail.sender || mail.from_addrs.first
      return_path = "-f \"#{envelope_from}\"" if envelope_from

      arguments = [settings[:arguments], return_path].compact.join(" ")
      
      Sendmail.call(settings[:location], arguments, mail.destinations.join(" "), mail)
    end