Enabling Pop3, Port 110 on domino

We have recently installed Inboxer to handle archiving but we are having trouble communicating through Pop3, Port 110. I have enabled port 110 on the server document and made the changes to the notes.ini. Our configuration is the following: an ip address for NRPC, an ip address for SMTP (2 nic cards on the server), I added another line in the notes.ini for the 3rd TCP/IP port (Pop3, port 110). The error I am receiving is the following: The TCP/IP stack cannot bind to a network address to a TCP socket.

Can anyone please advise as to what I am doing wrong.