Whitelist Nightfall IP Addresses
Once you create the rules, you must whitelist the Nightfall IP addresses to allow emails sent by Nightfall back to your domain.
To whitelist Nightfall IP addresses:
Login to your Google Workspace with an admin account.
Click the menu icon.
Select Admin.
In the left menu, expand Apps and then expand Google Workspace.
Click Gmail.
Scroll down and select Routing.
Scroll down to the SMTP relay service section and click ADD ANOTHER RULE (the button can be displayed as CONFIGURE if you have not created any SMTP rules).
Enter a name for the SMTP rule.
Select the Only accept mail from the specified IP addresses check box.
Click ADD.
Contact your Nightfall CSM or sales representative to get the IP addresses to be entered in the next steps.
Enter a description in the Description field.
Enter the IP address in the Enter IP address/range field.
Click SAVE.
The IP address is added. Repeat steps 10-13 to add the other two Nightfall IP addresses.
Click SAVE.
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