I have an issue with Zoho Server when I'm using Outlook Mac

I have an issue with Zoho Server when I'm using Outlook Mac

The last few days and from time to time I'm not able to see over the half of my Inbox messages when I'm using Outlook for Mac to access the Zoho Server. Moreover when I'm sending an outgoing message ,I'm not able to find it onto Sent Folder. At the same time when I use Zoho Mail everything is visible without having any issue.