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 USERusername+OK User name accepted, password please PASSpassword+OK Mailbox open, 1 messages QUIT +OK Sayonara Connection closed by foreign host.
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