Google Outbound Services Configuration Guide - Manual (Page 52)

56 Outbound Services Configuration Guide
Legal Disclaimer
This guide describes how Postini products work with Microsoft Exchange and the
configurations that Postini recommends. These instructions are designed to work
with the most common Microsoft Exchange scenarios. Any changes to Microsoft
Exchange configuration should be made at the discretion of your Microsoft
Exchange administrator.
Note: Postini Customer Care does not provide technical support for configuring
mail servers or third-party products. In the event of a Microsoft Exchange issue,
you should consult your Microsoft Exchange administrator. POSTINI ACCEPTS
NO RESPONSIBILITY FOR THIRD-PARTY PRODUCTS. You may also contact
Postini Professional Services for consulting services and options.
Links to Microsoft Exchange Web sites are provided for your convenience. The
links and their content may change without notice. Please consult the product's
Web site for the latest configuration and support information.
Choose Smarthost Method
Setting up a smarthost on an SMTP connector alone can cause delays, since any
failed outbound message will cause an interruption of mail flow.
To prevent interruption of mail flow, you can either reduce the retry interval or use
a new Virtual Server.
Which Method to Use
Before you set up a smarthost with Microsoft Exchange 2000/2003 in a multi-
server environment, decide which method to use.
• Configure a Virtual Server, and pointing any outgoing SMTP connectors to
that server, is recommended for most large environments. It causes the least
delays. If you have a large environment, or you do not have connectors
enabled, use this method.
• Configuring a connector, and reducing the retry interval on the bridgehead
server reduces delays, but does not eliminate them completely. However, it
may be easier to configure. If you have a small environment, or if you are
unable to set up a virtual server, use this method.
Details About Virtual Servers and Connectors
Most configuration settings in Microsoft Exchange 2000/2003 servers are made
for Virtual Servers. A Virtual Server acts as a separate machine, though it may
reside on the same hardware as other Virtual Servers.
In a multi-server Exchange environment, SMTP connectors route mail traffic in a
controlled manner.