Google Postmaster is free, it's been available since 2015, and it shows you exactly what Google thinks of your email domain. Almost no one is using it. That needs to change.
Jonathan first set up Google Postmaster in 2015 the year it launched. He's used it with every client since. And in over a decade of email work, he's almost never encountered another marketer who had it set up correctly, or at all.
The analogy is simple: Google Analytics tells you what's happening on your website. Google Postmaster tells you what's happening with your email domain in Gmail's eyes. Domain reputation. Spam rate. Authentication. Delivery errors. All of it, updated daily, completely free.
This is one of the first things Jonathan implements with any new client. It takes under 15 minutes to set up and gives you a permanent, ongoing window into the health of your email program. If you send email, you need this. There is no reason not to have it.
The video above is the complete walkthrough setup from scratch, how to read every metric, what to watch for, and how often to check it.