If you decide to verify email addresses one at a time, you can draft a message like the following: “Hello, I am sending this email to check if this address is valid.

Instead of simply plugging in your email address, you plug in your email address with a random string attached to it after a +.

However, you can add an additional email address to that account to receive emails from Apple. For any other email addresses you can change the email address used with the Apple ID.