Testing Deliverability with Mail-Tester
On a separate browser window/tab, go to https://www.mail-tester.com
Copy the email address provided on the page (don't close the browser window/tab)
In QuickMail, head to the Prospect List and click Add Prospect. Use the email address copied from Mail-Tester.
Add that Prospect to a Campaign of yours, and start them on their Journey. After an email has been sent, head back to the Mail-Tester.com browser window and click "Then Check Your Score".
Check your test results and click the "+" buttons to see the details. You can also copy the link to the test results and send it to firstname.lastname@example.org if you're unsure about what the results mean.