I have changed the MX entry to the Zoho mail server. Now I can successful receive emails from my gmail account, but when I sent emails, Gmail shows a delivery failed error as follows:

"The error that the other server returned was:
550-Please turn on SMTP Authentication in your mail client.
550-mail-oi0-f51.google.com  [209.85.218.51]:34885 is not permitted to relay
550 through this server without authentication."

This is my domain name:http://ttikondotty.in/

Thanks in advance for your help and for creating this awesome email service. 

Sajith.