My Zoho mail hasn't been receiving emails.

My Zoho mail hasn't been receiving emails.

Hi,

My Zoho mail stops receiving emails.

The last email I received was sent to me on the 28th Feb 2019.
Recently I've tried to send emails to my own other email addresses, and reply back. My Zoho mail received none. And only one of the other addresses received one email from my Zoho address.
Please help!
My domain graceedu.top
I am using 0.18GB.