553 Relaying disallowed - URGENT

553 Relaying disallowed - URGENT

Hi, i configured 3 email accounts on ZOHO under the domain rambla.co and i can send mails with no problem, but each time i try to recive one i get the following message: 

Technical details of permanent failure: 

Google tried to deliver your message, but it was rejected by the server for the recipient domain rambla.co by mx.zohomail.com. [74.201.154.201].

The error that the other server returned was:
553 Relaying disallowed


Any ideas guys? 

I would really apreciate any kind of input to solve this problem.