My customer is using Oracle Netsuite to send us enquiries and PO's. It is strange that these are not being received in my Zoho Mail account. It is not even bouncing back. I am not sure why is it is not being shown. 

I wrote to support@zoho.com but the problem still is there. It is the big issue because I am losing out on opportunities and if the problem persists i might have to move to another server due to the seriousness of the issue