The email relay section will be locked because you have no verified domains yet.
To verify your domain, navigate to “Outbound Management” (Shield icon) and then click on the “Domains” tab to continue.
This is a quick overview of the domain verification process. To view the full guide click here - https://trustifi.com/docs/general/domain-verification/
Now, we will need to add the domain used to send emails. Continue by clicking on the “Add Domain” button.
After adding the domain, you will have to copy and import the records to your DNS provider (e.g. DNS Made Easy, GoDaddy). Continue to the next step after all the DNS records have been imported to your DNS environment.
Note: You can also click on "Download records CSV" from the "Actions" menu to save these records as a CSV file.
After you have added all the DNS records to your domain, click on “Check if verified” to see if the status changes to “Verified”. Continue to the next step only if the domain has been verified.
Note: Depending on your DNS system, your domain may take up to 24 hours to update DNS records.
In this part, you will need to enable the Email Relay toggle, and copy the “Email Relay key” which is the secret key that will be used to authenticate the transport flow of your emails. At the "Plan Settings" page, scroll to the "Email Relay Integration" section.
Navigate to the “G Suite Admin Center” via the following link – https://admin.google.com/
After you have logged in, input "hosts" in the search bar and select the first option.
Scroll down the page and click on "Hosts".
Adding host route
Click on "ADD ROUTE" under "Hosts".
Name your host, select “Single host”, enter “smtp.trustifi.com” with port “25”, both without double quotes, make sure both boxes of “Require secure transport (TLS)” and “Require CA-signed certificate” are checked and continue by clicking “Save”.
Make sure your host's address and port are correct.
Enter "routing" in the top search bar and select the first option.
Step 14 – Adding a new route
Now we will need to configure a new route to use our new host. Scroll down until you find the “Routing” section, move your mouse over the “Routing” row under “Routing” section, and click on “Configure”.
Name your routing rule, check the “Outbound” and “Internal – sending” check boxes.
In case you have no multiple domains under G Suite, you can skip this step. A section number 2, check the “Only affect specific envelope senders” checkbox, select “Pattern match” at the drop-down menu, enter “.*[@]domain[.]com$” (Without double quotes), instead of domain and com, replace with your domain’s name and your top-level domain (e.g. .net, .com, .org). Click on “Test expression” and enter your email address, make sure the status is “Match”.
Step 17 – Modifying the route
Scroll down to section number 3, make sure “Modify message” is selected, and check the “Add custom headers” checkbox. Click on “Add”, and enter “x-trustifi-creds” (Without double quotes) and paste the secret key you have copied from the Trustifi Admin Panel and click on “Save”.
Now we will have to set the route for this routing rule for our new host. Check the “Change route” checkbox, click on “Normal routing” and select the host you’ve created by his name.
Click on “Save” to save all changes.