When configuring a new domain for Proofpoint Essentials, all of a customer's domains must be both verified and have the relay enabled so that they can send and receive emails.
IMPORTANT: Once the domain has been verified and enabled, you MUST wait 60 minutes before the domain is available for routing inbound and outbound.
Adding Domains to Proofpoint
Log into the Proofpoint portal that matches your tenant's region.
If you are adding a domain for a customer rather than your own account, navigate to Customer Management > Customers and click on them in the list. Once you are logged in, navigate to Account Management > Domains.
To add a new domain to Proofpoint, click the New Domain button:
Set the domain type to Relay. For the primary delivery destination, fill in the value of the domain's current MX record. For Google Workspace domains, the format should resemble ASPMX.L.GOOGLE.COM.
You may also have additional Google MX records published with a lower priority. These can be added to Proofpoint as failover delivery destinations.
Before setting up an existing domain, click on the three dots on the right side of the screen, then click Edit Domain:
Ensure that the domain type is set to Relay and that the correct delivery destination (the value of your default Google MX record) is filled in.
Prepare Google Workspace Routing
On the Account Management > Domains page, click on Manage Hosted Services:
Turn on the option for Google Apps, then click Save.
Verify and Enable Domains
For each domain on the Account Management > Domains page, click the Verify Domain button:
This will display a TXT record that will need to be added to the domain's DNS zone. Once this TXT record is published, click on Verify Now.
Once this is complete, you may now click the button for Enable Relay next to your domain on the Account Management > Domains page.
Once enabled, the relay needs at least 60 minutes to fully activate before proceeding.
Proceed to next step: Update SPF Record