Strongly disagree. All of the identity issues aside, ensuring deliverability is another key issue. Some email providers can be very aggressive when it comes t

Strongly disagree. All of the identity issues aside, ensuring deliverability is another key issue. Some email providers can be very aggressive when it comes to marking emails from new services as spam. Getting a user to pick a confirmation email out of their spam folder and click "Not Spam" is the most important action that user can do as part of the signup process, otherwise you will never reach that person's inbox again.