Set Internet Protocol (IP) restrictions on an SMTP virtual server
Edit by : Use the SMTP Internet Protocol Restriction and Accept/Deny List Configuration to programmatically set or view Internet Protocol (IP) restrictions on an SMTP virtual server and to add or remove IP addresses from your global accept or deny lists. Microsoft Exchange 2003 provides connection and relay control for its Simple Mail Transfer Protocol (SMTP) virtual servers. Additionally, Exchange 2003 provides connection filtering that allows you to configure IP addresses from which you want to accept connections or from which you want to always deny connections. These settings are configured in global accept and deny lists in Connection Filtering. An administrator can use these controls to limit the computers that can Connect to a virtual server or that can relay e-mail to outside the Exchange organization.

Note This tool can be used against Exchange 2000 servers but the global accept and deny list configuration is only applicable to Exchange 2003 servers. If Active Directory has been updated with the Exchange 2003 schema then the tool can be used to configure entries on the global accept and deny lists, but this configuration is only available on Exchange 2003 servers. you can free download Exchange Server SMTP Internet Protocol Restriction 1.0 now.