> How do you prevent people from entering in the wrong address, and thus a random person receiving your emails? Double opt-in. You cant just enter an email ad

> How do you prevent people from entering in the wrong address, and thus a random person receiving your emails? Double opt-in. You cant just enter an email address to subscribe, I used to send you an email with a link to click to complete the process. For transactional email this would be handled by getting people to either create an account or use Paypal for guest checkout. (this was 2012)