Do they need to confirm their email… twice?

1. Why are people often asked to enter data twice?
2. What happens when you send an email twice?
3. Why do you have to enter your email address twice?

Why are people often asked to enter data twice?

It's just to try and ensure that you enter the correct address, without typos. Since email addresses are usually the primary contact information for websites, it's considered worth the extra effort to try and make sure it gets entered correctly. It's sometimes called two-pass verification.

What happens when you send an email twice?

Resending virtually the same email twice runs the risk of causing email fatigue and recipients flagging you as spam. Plus, even if you only resend to those who didn't open the first email, there's no way to know if your recipients deleted your original message on purpose.

Why do you have to enter your email address twice?

This ensures that the information you entered is correct. Entering the email twice enforces you to unconsciously validate your email address.