Grant access by IP Address, Subnet, and Domain
If you have a small number of clients who use the POP3 service, you can create an exclusive group of computers that can access the server. Computers that are permitted to use the service can be identified by IP address, subnet mask, or domain name.
Identify a permitted computer by IP address only if you assign IP
addresses statically. If a
To grant access by IP address, subnet, and domain:
Tip If you only know the name of the computer, click DNS Lookup. Type the name of the computer, and then click OK. If resolved, the IP address appears in IP address automatically.
Note By default, POP3 virtual servers grant all computers access. If you create an exclusive group of permitted users for one POP3 virtual server, the list applies only to that one POP3 virtual server. To limit access to other POP3 virtual servers, you must add groups of computers to each instance of a POP3 virtual server.