# File lib/em/protocols/smtpserver.rb, line 193
      def receive_line ln
        @@parms[:verbose] and $>.puts ">>> #{ln}"

        return process_data_line(ln) if @state.include?(:data)
        return process_auth_line(ln) if @state.include?(:auth_incomplete)

        case ln
        when EhloRegex
          process_ehlo $'.dup
        when HeloRegex
          process_helo $'.dup
        when MailFromRegex
          process_mail_from $'.dup
        when RcptToRegex
          process_rcpt_to $'.dup
        when DataRegex
          process_data
        when RsetRegex
          process_rset
        when VrfyRegex
          process_vrfy
        when ExpnRegex
          process_expn
        when HelpRegex
          process_help
        when NoopRegex
          process_noop
        when QuitRegex
          process_quit
        when StarttlsRegex
          process_starttls
        when AuthRegex
          process_auth $'.dup
        else
          process_unknown
        end
      end