Mail server be Open Relay Test

1.Click「start」「run」keyin「cmd」(Enter)
2.prompt command keyin「telnet」(Enter)
3.Into Telnet keyin「set localecho」(Enter)
4.keyin target of mail server FQDN like this command「open mail.yourdomain.com 25」(Enter)，format : open IP(or Donamin) Port
　A.reply : 220 mailserver.local Microsoft ESMTP MAIL Service ready at Thu, 16 Apr 2009 16:36:25 +0800
5.keyin a domain or ip from mail server to be sender, don`t use target of server, keyin command「helo abc.com」(Enter)
　A.reply : 250 mailserver.local Hello [IP]
6.keyin a sender mail like this command「mail from:123@abc.com」(Enter), don`t use account from target of server
　A.reply : 250 2.1.0 Sender OK
7.keyin a account to receive like this command 「rcpt to:456@abc.com」(Enter), don`t use account from target of server
　A.reply 1 : 550 5.7.1 Unable to relay, this target of mail server can`t be a open relay server for
　B.reply 2 : 250 2.1.5 user@spam.com, this target of mail server can be a open relay server for anyone to send mail to anyone.
8.keyin「quit」to exit，keyin「exit」 exit from cmd mode