I’ve written extensively about the importance of having a dedicated tracking domain for your GMass account. Now, you can set your tracking domain all on your own after you’ve implemented the DNS setup for it.
Set your dedicated tracking domain in GMass
Compose a new message in Gmail, put firstname.lastname@example.org in the To field, and put the tracking domain you created in the Subject. Then hit the main GMass button. Do not hit the Send button.
Note: For instant approval, your tracking domain must contain the domain of your G Suite email address. Meaning, if you are email@example.com, your tracking domain should be something like link.abcwidgets.com. If your email address domain and your tracking domain don’t match, your request will be accepted but will be held for manual approval.