I recently stepped over to zoho mail ( from outlook.com ) with my custom domain.

When i setup zoho mail in ios default mail app , everything seems to be ok , but when i try to read the contents of the mail it stays empty.

any thoughts ? 

I know i can use the zoho mail app from the appstore , but i would like to use the apple default mail app.

Maybe it's an ios 10 beta issue, i can test on ios 9 later this day.