Email errors

Email errors

I'm seeing a strange error when I receive any notification from Zoho CRM. It appears as though zoho is trying to relay through my exchange server. Below is the error message that I get back:

Your message did not reach some or all of the intended recipients.

Subject: A New Task (Subject: New Lead Entered - Follow Up Call Needed) is assigned to you
Sent: 10/17/2007 9:13 PM

The following recipient(s) cannot be reached:

Ira Rozen on 10/17/2007 9:14 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
< resolver2.sv4.zoho.com #5.7.1 SMTP; 550 5.7.1 Requested action not taken: message refused>










any ideas?? I've checked my exchange server and don't see where the problem is.