         # File lib/em/protocols/smtpserver.rb, line 231
    231:       def process_helo domain
    232:         if receive_ehlo_domain domain.dup
    233:           send_data "250 #{get_server_domain}\r\n"
    234:           reset_protocol_state
    235:           @state << :ehlo
    236:         else
    237:           send_data "550 Requested action not taken\r\n"
    238:         end
    239:       end