6.25 Release Notes : Use Google Apps Gmail with Postini

Use Google Apps Gmail with Postini
This update introduces a new feature that makes it easy to route your email traffic through Postini to Google Apps Gmail. The new “Use Google Apps Gmail” feature in the Administration Console helps optimize delivery to Google Apps, or pilot Google Apps Gmail for a small group of users.
Use Cases
More information on use cases will be available in the Administration Guide when the feature is released.
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Piloting Google Apps Premier and Education Edition: You can use the feature to route email for a portion of your users to pilot Google Apps Gmail or as you migrate groups of users to Google Apps Gmail. To set up a split delivery pilot, create a new email config organization that uses Google Apps Gmail, then move pilot users to a user org under your new email config.
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Optimizing delivery to Google Apps: If you've already configured your email delivery to Google Apps Gmail, you can keep your current settings or use the new routing feature. With the new routing feature, Postini Delivery Manager automatically synchronizes with the Gmail servers and shares spam information for Gmail processing.
System Requirements
To use the Google Apps Gmail feature, you will need the following:
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If you want Postini to process outbound mail as well, this option is available only with Google Apps Premier or Education Edition and is configured in the Google Apps Control Panel.
Setup
Set up the new Gmail routing feature in the Postini Administration Console, and then configure outbound and other settings (such as SPF and IP Whitelisting) in Google Apps control panel. When the Gmail routing feature is released, you can find step-by-step setup instructions in the Message Security Administration Guide.
For a complete set up of Google Apps and Postini:
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To use the new inbound Gmail routing feature, go to Delivery Manager > Edit in the Administration Console.
Mail flow will route to Gmail immediately after you save your changes, and you can change back just as quickly.
Important: If you activated the Postini for Google Apps service through the Google Apps control panel, this feature do not apply -- no action is required. The Postini service automatically takes care of routing to Google Apps in the background.