Everything was working fine until yesterday.  Now when I archive or read emails in Apple Mail on a Macbook they are not showing as read on the server or my other devices (all software up to date, no system changes made). Email set up via IMAP for incoming and SMTP for outgoing. I tried restarting, and rebuilding mailbox.

Other accounts eg gmail work fine, so seems to be a Zoho / Apple Mail problem. Any suggestions? Many thanks.