Using telnet (or putty) it’s possible to some simple tests against a POP server. By no means exhaustive, it can give you insights in where to start troubleshooting.

First, using telnet and open a connection the remote POP server

telnet mailserver 110

Where mailserver is the mail server you want to connect to. Note that port 110 is the default port for POP, but could be different depending on your servers settings.

Once connected, use USER and PASS to login.

[root@ms1 ~] # telnet localhost 110
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
+OK POP3 localhost v2001.78rh server ready
USER username
+OK User name accepted, password please
PASS password
+OK Mailbox open, 1 messages
QUIT
+OK Sayonara
Connection closed by foreign host.

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