Email missing? Cannot find in neither Junk folder nor Deleted Items as well?

If you someday somehow cannot find your email, even searched through your junk mail or deleted items also cannot find it, at last have to recover it using Outlook Recovered Deleted Items or even restore from your backup.

Then you will ask yourself, or the Email Administrator, why could this happened?

In your Outlook, there is a junk mail setting. Make sure your junk email setting is not enable the option of Permanently delete suspected junk e-mail instead of moving it to the Junk E-Mail folder.

Every email missing issue might not be due to this, however, it could be the reason.

So, please check. :)