nikukyu:~$ telnet mail.ep.sci.hokudai.ac.jp 25
Trying 133.87.45.66...
Connected to blue.ep.sci.hokudai.ac.jp.
Escape character is '^]'.
220 blue.ep.sci.hokudai.ac.jp ESMTP
helo nikukyu.ep.sci.hokudai.ac.jp 
250 blue.ep.sci.hokudai.ac.jp
mail from:<choji@ep.sci.hokudai.ac.jp>
250 ok
rcpt to:<choji@ep.sci.hokudai.ac.jp>
250 ok
data
354 go ahead
Hello
.
250 ok 981044164 qp 23263
quit
221 blue.ep.sci.hokudai.ac.jp
Connection closed by foreign host.