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Controlling SMTP virtual server relaying
1. Launch Exchange System Manager. Navigate to your SMTP virtual server (it's under Administrative Groups | yourAdminGroup | yourServerName | Protocols).
2. Right-click the virtual server and choose the Properties command.
3. Select the Access tab.
4. To restrict inbound SMTP connections to a particular address range (for example, if your POP3/IMAP4 clients are using a block of addresses via a VPN or dial-up connection), use the Connection… button to specify which addresses may make SMTP connections. Note that the settings in the Connection dialog apply to all hosts that try to use this SMTP server. To control SMTP relaying, click the Relaying button. In the Relay Restrictions dialog box (see Figure 1), you can do the following:
o To turn off all relaying from everywhere, select the "Only the list below" radio button, then leave the Computers list blank. This is the default setting.
o To allow relaying from a single computer or block of network addresses, use the Add button (see Figure 2) to add the IP addresses or blocks that you want to be able to relay. You can also allow relaying by domain name instead of IP address, although there is a performance penalty if you do.
o To block a specific set of IP addresses, select the "All except the list below" radio button, then use the Add button to add the specific computers or network addresses that you want to be able to relay. o To allow computers that authenticate to Exchange to relay, no matter what other restrictions are in place, make sure that the "Allow all computers which successfully authenticate…" checkbox is turned on.