Don't delete people's emails without notifying them
At the very least you should contact their backup emails. It makes me sick knowing all my communication with lost friends, family and my Grandma are just gone.
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If your account has had no activity for 365 days, then the account is deactivated. We communicate this a few times which includes sending you an email to your alternative email account, so make sure that is updated. If you need help reinstating, contact our CC team at help.yahoo.com. They have the tools to help with these issues. Hope this helps!