Mail Notes
From MediaWiki
Telnet To Pop Server
One can use the telnet utility to check if a POP mail server is working (this can be useful if you are trying to determine if you are dealing with a server which is down, or a mis-configured client). The following commands demonstrate how one logs in and requests the list of mail message currently in the buffer:
POP Session
[root@taco ~]# telnet pop3.mail.host.domain 110
+OK Hello There
USER email_login
+OK Password required.
PASS email_password
+OK NUM_MSGS NUM_BYTES
LIST
1 1400 2 57839 ...
QUIT
+OK Connection to host lost.[root@taco ~]#