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Your email, once scanned by Postini for spam, compliance, and security, will be handed off to your email server. It will come to you FROM GOOGLE POSTINI via the IP address ranges in the table below. Every firewall/email server accepts IP ranges in different formats. Choose the one most appropriate for hardware/software.

You firewall should be configured to deny all connections inbound to your mail server on port 25 EXCEPT from the listed IP address ranges. This makes it absolutely necessary for email to first be processed by Google Postini before being received on your end. Should your security policy also call for outbound processing you may also configure the reverse forcing outbound email be delivered to the same IP ranges.

NOTE! If this information leads to follow up questions like, "What does all these mean?", "Where do I enter this?," or similar then you probably shouldn't be attempting this yourself. Please contact us to help you through the process.