Apple Mail not syncing Inbox Status (Read/ Unread)
This is Ramya from Zoho Mail Technical Support team.
When a Zoho Mail account is configured as IMAP in Apple Mail client in Mac Mail clients, the emails are synced fine in all folders except Inbox.
When the emails in Inbox are marked as Read/ Unread in other devices, the emails are not marked as Read/ Unread in the Mac Mail client. The new emails that arrive in Inbox are getting retrieved in the mail client, but only the status of the emails in Inbox remain unchanged.
After analyzing the logs in detail, we see that Apple Mail is not issuing the IMAP STATUS command for Inbox folder alone.
To check if there is any issue, we tried configuring Yahoo, Dovecot email accounts in Mac Mail client and the result was the same for Yahoo and Dovecot accounts also.
Interestingly, when we configure a Gmail account as IMAP, Apple Mail issues the IMAP STATUS command and syncs the status of the emails in the Inbox folder also.
We have a lot of users who use Zoho Mail via IMAP in Apple Mail Client who face this issue and have raised it to us in our community forums, emails. You can have a look at the https://forums.zoho.com/topic/zoho-and-apple-mail-via-imap to find the issues reported by the user regarding Apple Mail IMAP sync.
iMac, Mac OS X (10.7.5)