Authentication required to send mail

Authentication required to send mail

Hi

I'm having troubles to receive mail notifications from Zoho CRM.

Here is the message that your server is receiving from my SMTP Server's Provider:
*****
The original message was received at Tue, 30 Jan 2007 21:26:32 -0800
from [192.168.150.192]

----- The following addresses had permanent fatal errors -----
<acruz@tekbrain.com>
(reason: 553 Authentication is required to send mail as <acruz@tekbrain.com>)

----- Transcript of session follows -----
... while talking to smtp.mail2.triara.com.:

>>>>>> MAIL From:<acruz@tekbrain.com> SIZE=2294

<<< 553 Authentication is required to send mail as <acruz@tekbrain.com>
501 5.6.0 Data format error



Reporting-MTA: dns; resolver1.idc.adventnet.com
Received-From-MTA: DNS; [192.168.150.192]
Arrival-Date: Tue, 30 Jan 2007 21:26:32 -0800

Final-Recipient: RFC822; acruz@tekbrain.com
Action: failed
Status: 5.1.3
Diagnostic-Code: SMTP; 553 Authentication is required to send mail as <acruz@tekbrain.com>
Last-Attempt-Date: Tue, 30 Jan 2007 21:26:40 -0800
*****
How could it be fixed?

Regards

Alberto Cruz