Add or remove email accounts in Mail on Mac. Use the Mail app to send, receive, and manage email for all of your email accounts in one location. Simply add the accounts—such as iCloud, Exchange, Google, school, work, or other—you want to use in Mail.
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Note that after it is deleted, it can no longer be reused for new sign up as Google does not recycle deleted email addresses. If there is a possibility that you might need it in future, you might want to leave it for few months before deleting it.
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