If you enable HTTP logging in the server document (Internet ProtocolsHTTP section), you can capture IP and/or computer name. Use the domlog.nsf. It does the trick for basic logging.
Dig Deeper on Lotus Notes Domino Administration Tools
Related Q&A from Michael Lazar
Learn how to easily keep track of the numbers of incoming and outgoing Lotus Notes email messages to and from your Domino server each day. Continue Reading
Discover what steps you can take if your Lotus Domino server runs out of disk space and you have issues sending and receiving Lotus Notes email ... Continue Reading