Sounds like a corrupted index in the mail program.
> On Apr 5, 2018, at 2:59 PM, Randy Zumwalde <firstname.lastname@example.org> wrote:
> I have a user who's account is set up using IMAP on all his devices using the Mail app.
> For months now, his web mail inbox is always empty. He's tried resending/refreshing from both ends and still nothing.
> Any idea why his web mail inbox would show up empty?