Step 1: First login to the Mailtoon Application and go to the custom domains page at https://app.mailtoon.io/custom-domain and click the “Add New” button.
Step 2: Enter your custom domain url and click at Confirm button.
Step 3: Go to your “Advanced DNS” settings and add an “A Record” with these values and save.
Values:
Type: A Record
Value: 37.16.13.110
Host: subdomain or @(for root domain)
TTL: 60 min / Automatic
Now your custom domain is ready to use.
[Note:Sometimes it could take some extra time depending on your domain provider]