"gonna just register my own domain and set up a server somewhere" ..... only to find that you have problems delivering email to Gmail users, who are everywhere

"gonna just register my own domain and set up a server somewhere" ..... only to find that you have problems delivering email to Gmail users, who are everywhere. :/ I experienced this same problem when moving to a new hosting provider and IP set. couldn't sent mail to Google properties/hosted accounts until my IP's email reputation score was high enough to be approved by whatever lurks in Google.