Firstly, ensure the appropriate allowlisting has been completed. For further guidance on this, please refer to the article Allowlisting in Gmail Workspace or Gmail Apps.

Next, follow these steps to add our IP address as an Inbound Gateway.

1. Log in to your Google Admin Console.
2. Navigate to Apps > Google Workspace > Gmail > Spam, Phishing and Malware.
3. Under Organizational Unit, select your top-level organisation - typically your primary domain - on the left.
4. Scroll down to the 'Inbound Gateway' setting. Click the setting and check the 'Enable' checkbox. This will open the 'Inbound Gateway' screen.

Configure the Inbound Gateway using the settings below.

1. Gateway IPs can be found in the article below:
   • MetaCompliance Mail Server IP Addresses - All Data Centres – MetaCompliance
2. Leave the 'Reject all mail not from gateway IPs' option unchecked.
3. Check 'Require TLS' for connections from the email gateways listed above.
4. MessageTagging: Enter text for the 'Spam Header' tag that is unlikely to be found in a PST email. This field is required.
   • Example: kzndsfgklinjvsdnfioasmnfroipdsmfs
5. Select the Disable Gmail spam evaluation on mail from this gateway; only use the header value option.
6. Click Save.