# File /Users/nshb/svn/svn.inimit.com/railsmanual.com/www/trunk/src/rails-2.0.1/actionmailer/lib/action_mailer/vendor/tmail-1.1.0/tmail/net.rb, line 84
    def add_message_id( fqdn = nil )
      self.message_id = ::TMail::new_message_id(fqdn)
    end