# File lib/protocols/smtpserver.rb, line 384
384:                 def process_rcpt_to rcpt
385:                         unless @state.include?(:mail_from)
386:                                 send_data "503 MAIL is required before RCPT\r\n"
387:                         else
388:                                 succeeded = proc {
389:                                         send_data "250 Ok\r\n"
390:                                         @state << :rcpt unless @state.include?(:rcpt)
391:                                 }
392:                                 failed = proc {
393:                                         send_data "550 recipient is unacceptable\r\n"
394:                                 }
395: 
396:                                 d = receive_recipient rcpt
397: 
398:                                 if d.respond_to?(:set_deferred_status)
399:                                         d.callback(&succeeded)
400:                                         d.errback(&failed)
401:                                 else
402:                                         (d ? succeeded : failed).call
403:                                 end
404: 
405: ??
406:                         end
407:                 end