[root@localhost root]# telnet localhost 110 Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
+OK Hello there.
user tester
+OK Password required.
pass testpw
+OK logged in.
list
+OK POP3 clients that break here, they violate STD53.
.
quit
+OK Bye-bye.
Connection closed by foreign host.
[root@localhost root]#