Emails are not being sent to the registrant or the registrar.
The FROM email address in the event(s) is the same as the SMTP user on the site. The SMTP provider defined in the site is smtp.gmail.com.
The feedback form (DNN core) and the DNN core user registration works as far as sending email notifications.
Can you confirm what other options could be double-checked?
DNN: 6.0.1
DSF: 4.0