root@ser [~]# telnet server.nojav.com 25
Trying 69.50.240.69...
Connected to server.nojav.com (69.50.240.69).
Escape character is '^]'.
220-ser.pigpaid.com ESMTP Exim 4.77 #2 Wed, 09 May 2012 10:30:12 +0900
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
helo server.nojav.com
250 ser.pigpaid.com Hello server.nojav.com [69.50.240.69]
mail from:mail@nojav.com
250 OK
rcpt to:pigpaid@gmail.com
550-Please turn on SMTP Authentication in your mail client. (server.nojav.com)
550-[69.50.240.69]:40294 is not permitted to relay through this server without
550 authentication.