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Setting up UTM as an inbound gateway for your google hosted mail, allows you to take advantage of all of the mail filtering benefits of UTM, or Sophos Mail Gateway, combined with all of the benefits of using a hosted mail solution.
In UTM's web interface, navigate to Email Protection > SMTP > Routing
Finally, under Email Protection > SMTP > Relaying > Host-Based Relay, add the same Google hosts created above.
This is all that is needed within UTM's web interface.
Inbound and Outbound Setup (Optional)
Inbound and Outbound gateway setup is not available in the free Standard version of google apps, but is available in edu and other paid versions. Setup is not necessary, but without inbound gateway setup, it is possible to bypass Astaro's spam filtering and send spam directly to google's servers.
In your Google Apps domain administration dashboard, select Service Settings > Email.
If you wish to send all outbound mail back through the UTM for scanning, then fill in the outbound gateway field with UTM's public IP. In the inbound gateway section, enter all public IP addresses your UTM may send from. You may also want to check the box labeled 'Only let my users receive email from the gateways listed above.' This will prevent spam from possibly bypassing your UTM's protection.
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