[root@mail ~]# telnet 192.168.1.1 110
Trying 192.168.1.1...
Connected to mail2.origo.com.tw (192.168.1.1).
Escape character is '^]'.
+OK mail2 Cyrus POP3 v2.2.12-Invoca-RPM-2.2.12-3.RHEL4.1 server ready <892859772.1120187197@mail>
USER eugenelee
+OK Name is a valid mailbox