Edge server such as ISA you install it and it acts as an additional layer to the SMTP gateway.
Edge transport server in Exchange 2007 with GFI I have not tested yet - give your nearest GFi reseller a call.
Setting up the edge:
To create Internet connectors that are configured to send e-mail between an Exchange 2007 Hub Transport server and an external SMTP gateway by using Basic authentication
To use the Exchange Management Console to create the Send connector from Contoso.com to the Internet through an external SMTP gateway, follow these steps:
Open the Exchange Management Console. Expand Organization Configuration, click Hub Transport, and then, in the action pane, click New Send connector.
On the New SMTP Send Connector wizard Introduction page, in the Name field, type a unique name for the connector.
From the Select the intended use for this connector drop-down list, select Custom, and then click Next.
On the Address Space page, click Add. In the Add Address Space dialog box, type "*" for the name of the remote SMTP domain, and then click Next.
On the Network Settings page, only the Route all mail through the following smart hosts: setting can be selected. Click Add.
In the Add Smart Host dialog box, in the IP address or Fully qualified domain name (FQDN) field, type the IP address or FQDN of the external SMTP gateway server, and then click OK. To specify more than one SMTP gateway as a smart host, click Add and enter additional IP addresses or FQDNs, and then click Next.
On the Smart host security settings page, select Basic Authentication or Basic Authentication over TLS, type the user name and password that will be used to authenticate the connection, and then click Next.
On the Source Server page, click Add. In the Select Hub Transport and subscribed Edge Transport servers dialog box, select one or more Hub Transport servers in your organization, click OK, and then click Next.
On the New Connector page, click New, and then on the Completion page, click Finish
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