Without SSL
To test a POP3 account from command line follow these steps. This will connect to the POP3 server using telnet, list the available emails, and retrieve the first one.
telnet <your-email-server>:110
Connected to your-email-server-ip...
Escape character is '^]'.
user <your-mail-server-username>
pass <your-mail-server-pass>
list
retr 1
quit
With SSL
If you are getting the following error, you will need to access your POP3 server using SSL
user <user-mail-server-username>
- ERR Command is not valid in this state.
To use SSL, use
OpenSSL to connect to the server
openssl s_client -crlf -connect <your-email-server>:995
....
+ OK The Microsoft Exchange POP3 service is ready.
user <your-mail-server-username>
+OK
pass <your-mail-server-pass>
+OK User successfully logged on.
list
retr 1
quit
