I stopped receiving email in my Zoho CRM after March 2015. Need help with fixing this.

I stopped receiving email in my Zoho CRM after March 2015. Need help with fixing this.

Hi

I used to use a free version of Zoho CRM and a paid version of Zoho Mail. Note that this was IN ADDITION to our company's regular email hosting provider (InMotionHosting).

I was able to receive all contact related emails in Zoho CRM - however, after that it stopped working.

I see that the last email I received in Zoho Mail was March 4, 2015 and the last email received in Zoho CRM was Feb 26, 2015.

I checked and it looks like I still have 20% of storage available on Zoho Mail.

Also, it looks like my domain is authenticated.

Not sure whether Zoho changed some policies regarding email hosting.

It now looks Zoho requires the MX records to be changed for email - which was not the case earlier. I definitely do NOT want to do that since we can get unlimited email users on InMotionHosting and I wouldn't want to pay $2/user/month on Zoho. I only want 5 (FIVE) users to be able to use Zoho CRM.

Can someone suggest what I can do to fix this?

Best,
Sudip