For many people, their Gmail account is the only personal email address they use. However, if your lose access to your Google account or it becomes compromised, selecting a secondary email address can help you recover the account. From your Google account page, open the Security tab. Then, scroll down to the section that says “Ways we can verify it’s you.” From there, open Recovery email. You might use the address for an account from an internet service provider or your work email. Just make sure to update this field if you change jobs or switch service providers.
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