Overview

Configure the hosted email server to accept email from MetaDefender Email Gateway Security server.
Configure MetaDefender Email Gateway Security to relay out to hosted email server.
Update MX record to point to MetaDefender Email Gateway Security server.

Detailed Steps

Steps		Details
1	Go to https://admin.google.com and login to your Google Apps subscription
	Click 'MORE CONTROLS'
	Click 'Apps'
	Click 'Google Apps'
	Click 'Gmail'
	Click 'Advanced settings'
	Scroll down to the 'Inbound gateway' section and click 'CONFIGURE'
	Specify a gateway name (e.g. Metadefender Email Relay) and the IP address of the MetaDefender Email Gateway Security server; check 'Automatically detect external IP (recommended)', 'Reject all mail not from gateway IPs' and 'Require TLS connection from the email gateways listed above'
	Click 'SAVE' at the bottom right of the screen to save the changes
2	Install MetaDefender Email Gateway Security and configure; for instruction see 1 Quick start with MetaDefender Email Gateway Security	Remember to configure relays to match your original MX record. For details see 4.2 Security rules .
	Configure MetaDefender Email Gateway Security to listen on port 25
	Verify routing settings by sending an email to a Google Apps recipient directly to the MetaDefender Email Gateway Security server and verify that it arrives correctly in the recipient inbox
3	Refer to your Internet domain registrar for details how to change MX record to point to MetaDefender Email Gateway Security IP address. Verify email routing by sending an email to a Google Apps recipient	Configure relays to match your original MX record; for details see 4.2 Security rules Make sure that your MX record changes have propagated before verifying email routing.

Quarantine: Google Apps always does a malware check on all incoming emails, so releasing an infected item from quarantine will be rejected by Google Apps. As a workaround for this, configure quarantine to deliver emails to an alternative SMTP server that can accept infected emails.