You can restore any deleted AOL Emails only in one situation: when you are trying to retrieve the email from the trash folder in the next seven days. The steps you need to follow while restoring the deleted AOL email from the Trash folder are:
Login to your AOL account.
Then open the Trash Folder option and look for the particular deleted email.
Once you find the email, click on it to restore it. The email will automatically get saved in the AOL inbox.
However, you should always remember after these seven days; the particular AOL email is deleted permanently from the Trash folder too. Therefore, you can call AOL email customer care phone number to get this email to restore for you.