Help! All inbox emails deleted after 7 days
Does anyone know what could be the reason that all emails in my inbox on my laptop Apple Mail program are deleted after 7 days. My server assures me that because I have an IMAP account they cannot delete my emails and they remain on the server. My iphone settings has "never" checked for removing deleted emails. There is no choice other than that. But my emails that have not been deleted are gone as well. I have gone round and round with this for about four months, been on the phone with Apple, but no solution. It all started, I believe, when I upgraded my operating system from Yosemite to High Sierra.
MacBook Air, iOS 10.3.3, High Sierra