Google Outbound Services Configuration Guide - Manual (Page 53)

Microsoft Exchange 2000/2003 Multi-Server (Smarthost method) 57
However, SMTP connectors require some special consideration during outbound
configuration, because they are primarily designed to route internal traffic. SMTP
Connectors automatically detect and attempt to route around failures. If any
receiving server rejects or defers a message, the connector will temporarily cease
to function. This can lead to a long mail queue and delayed delivery.
Set Up Reinjection
Before you can register your IP addresses in the Administrative Console or set up
a smarthost, you must allow reinjection. For an overview of reinjection concepts,
see “Set Up Reinjection” on page 14.
To allow reinjection, configure the IP ranges for Outbound Services to be a trusted
relay.
Set up a trusted relay
1. Select the Start Menu -> Programs -> Microsoft Exchange -> System
Manager
2. Expand the top level -> Servers -> -> Protocols -> SMTP
3. Right-click Default SMTP Virtual Server & select Properties.
4. Click the Access tab.
5. Click Relay.
6. Add IP ranges and other trusted relay servers and click OK to get back to the
Access tab. For a list of IP ranges, see “IP Ranges” on page 13.
7. Click the Connection button.