# File lib/em/protocols/smtpserver.rb, line 321
321:       def process_starttls
322:         if @@parms[:starttls]
323:           if @state.include?(:starttls)
324:             send_data "503 TLS Already negotiated\r\n"
325:           elsif ! @state.include?(:ehlo)
326:             send_data "503 EHLO required before STARTTLS\r\n"
327:           else
328:             send_data "220 Start TLS negotiation\r\n"
329:             start_tls
330:             @state << :starttls
331:           end
332:         else
333:           process_unknown
334:         end
335:       end