error receiving mail

error receiving mail

Greetings...
 
I am getting these errors when mail is sent to me:
 
"mx.zohomail.com rejected your message to the following e-mail addresses:

XXXXXX@XXXXXX.com

 mx.zohomail.com gave this error:

Relaying disallowed

 A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk."
 
I know the address is correct becasuse I have not fully switched over to ZOHO and the emails are coming into another email package. 
 
Help?
 
Be well.
 
paul