[root@srv1 html]# telnet localhost 25
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
Trying ::1...
telnet: connect to address ::1: Connection refused
telnet: Unable to connect to remote host: Connection refused
[root@srv1 html]# telnet myoffice.nl 25
Trying 213.206.105.211...
Connected to myoffice.nl (213.206.105.211).
Escape character is '^]'.
220 srv1.myoffice.nl ESMTP Sendmail 8.13.8/8.13.8; Mon, 4 Jun 2007 13:27:09 +020