# File lib/protocols/smtpserver.rb, line 355
355:                 def process_mail_from sender
356:                         if (@@parms[:starttls]==:required and !@state.include?(:starttls))
357:                                 send_data "550 This server requires STARTTLS before MAIL FROM\r\n"
358:                         elsif (@@parms[:auth]==:required and !@state.include?(:auth))
359:                                 send_data "550 This server requires authentication before MAIL FROM\r\n"
360:                         elsif @state.include?(:mail_from)
361:                                 send_data "503 MAIL already given\r\n"
362:                         else
363:                                 unless receive_sender sender
364:                                         send_data "550 sender is unacceptable\r\n"
365:                                 else
366:                                         send_data "250 Ok\r\n"
367:                                         @state << :mail_from
368:                                 end
369:                         end
370:                 end