I think the config is still wrong
Can you try to do "telnet host port" where host = pop3 host name, and port is the port number?
Before going further, are you sure you want to use webmail? It is a pop3 mail, not a imap mail so if you read the messages from your office into tiki, they will be moved to tiki and you will not be able anymore to see them in your office. You propably need to a imap reader