If you accidentally delete an email, you can often find it in the "Deleted Items" folder. You can restore it by selecting the email and choosing the "Move" or "Restore" option. If the email is no longer in the "Deleted Items" folder, you may be able to recover it from the "Recoverable Items" folder or use the "Recover Deleted Items" feature. However, the availability of these options depends on your email server settings.