The quick answer is, there is no quick answer. But there is a quick way to find out.
Install or activate the "WP Mail Logging" plugin.
Go to https://www.mail-tester.com/
Now register a new user to that email address. Usually I just call it "spam tester".
That should generate a new user email to the test address.
Now on the mail tester site, you will get a full report on the deliverability of the site generated email.