Comments by "John h Palmer" (@johnhpalmer6098) on "Why Do I Need Another Email Address to Access My Account?" video.
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I think you are missing the point. It's a form of 2 factor authentication. There are several ways to implement this, email (a separate one, ideally from a different provider), biometric (if using your phone), or by text messaging whereby they send you a code (use once, limited time to reply) that you then type in on your PC, something that says, it's you that is requesting a change. That's it. Some, though another email is the ONLY option, but that is I think becoming less and less. I personally have 3 emails, one is my primary one, and 2 others, one is Gmail as in it's needed for some services on Google, but they all require 2FA now, so I have had my main email (MSN) used for Gmail, and vice versa. Both are used so no issues there. I do often try to remember to log into my yahoo email periodically, though it is "used" by sites like Live Journal to send me notifications as it was for that kind of thing. I don't get into LJ much these days so Yahoo falls by the wayside mostly now.
But 2FA is often a requirement, along with password vaults to help you with recovering accounts.
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