Outbound Failure

[eastbr]

I am getting an Outbound failure notification when I try to send to a certain domain. Bounce back email indicates error 572 Relay not authorized. This just started happening recently we can still receive from the problem domain but not send to it.

This leads me to think that IMS is denying it for some reason. Does anyone know what error 572 indicates?
Here is the text of the bounce back Failure notice:

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

Subject: Email delivery test
Sent: 12/3/2003 9:12 AM

The following recipient(s) could not be reached:

name@company.com on 12/3/2003 9:54 AM
The recipient was unavailable to take delivery of the message
The MTS-ID of the original message is: c=US;a= ;l=Server-031203175418Z-14408
MSEXCH:IMS:ORGomain:Server 3572 (000B099C) 572 Relay not authorized

The Exchange admin email says: Outbound delivery Failure A mail message was not sent due to a protocol error 572 Relay not authorized.

Thanks in advance

 

[SamovarovV]

You need authorisation on exchange server. For this check on your client box "SMTP server need authorisation".

 

[eastbr]

Are you talking about in Outlook, where is that? Please explain.