Google Postini outbound configuration with Office 365

Hi all,
My company is currently looking into Office 365 migration. Currently we have Exchaneg 2010 on-premise with Google Postini services for mail security and e-discovery. We are routing all inbound and outbound e-mail trough the Postini-service for archiving
and compliancy reasons.
Inbound is quite easy to set up with the mail connectors in office365, but for outbound Postini requires the IP-adresses of the sending mail servers. Obviously this is constanly changing because of the cloud-based nature of Office 365, but there is no other
way of defining the outbound mailservers for my domain. So my question is as how to cirumvent this or how to define the IP-adresses used by the Office 365/EOP service for sending mail.
Any thoughts on this would be appreciated!

Have you looked up the IP addresses for your <domain>.onmicrosoft.com MX record, using a tool like
http://www.mxtoolbox.com? You are correct that they may change, though. Additionally, I don't know how Postini will handle reinjection to Office 365 - I've read that it's not supported.

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