To block mail from specific domains
1 Click the Server shortcut in the navigation pane.
2 Click the Mail icon in the Services group.
3 Click the Black List tab.
4 Click the Add Domain icon.
5 Specify the name of the domain from which you do not want to receive email. For example, evilspammers.net.
6 Click OK.
7 Repeat steps four to six to add as many domains as required.
To allow mail reception from specific domains or networks
1 Click the Server shortcut in the navigation pane.
2 Click the Mail icon in the Services group.
3 Click the White List tab.
4 Click the Add Network icon.
5 Specify an IP address or range of IP addresses from which mail must always be accepted.
6 Click OK.
7 Repeat steps four to six to add as many addresses as required.