# File lib/mail/network/delivery_methods/sendmail.rb, line 81
    def self.shellquote(address)
      # Process as a single byte sequence because not all shell
      # implementations are multibyte aware.
      #
      # A LF cannot be escaped with a backslash because a backslash + LF
      # combo is regarded as line continuation and simply ignored. Strip it.
      escaped = address.gsub(/([^A-Za-z0-9_\s\+\-.,:\/@])/n, "\\\\\\1").gsub("\n", '')
      %("#{escaped}")
    end