$ telnet 195.199.212.58 25
Trying 195.199.212.58...
Connected to server.klte-gyakorlo.sulinet.hu.
Escape character is '^]'.
220 server.klte-gyakorlo.sulinet.hu ESMTP Postfix
EHLO kele.dyn.hu
502
QUIT
221 Bye
Connection closed by foreign host.
$ telnet 192.168.10.252 25
Trying 192.168.10.252...
Connected to 192.168.10.252.
Escape character is '^]'.
220 server.klte-gyakorlo.sulinet.hu ESMTP Postfix
EHLO kele.dyn.hu
250-server.klte-gyakorlo.sulinet.hu
250-PIPELINING
250-SIZE 2097152
250-ETRN
250 8BITMIME
QUIT
221 Bye
Connection closed by foreign host.