I've seen this before when an Exchange SMTP Server setting was set up to allow external relaying.

In our case we enabled the authenticated SMTP (EHLO) processing settings in our SMTP/400 product and were able to relay after authenticating.

You might need to ask the network folks what may have changed.

Regards,
Richard Schoen
RJS Software Systems Inc.
Where Information Meets Innovation
Document Management, Workflow, Report Delivery, Forms and Business Intelligence
Email: richard@xxxxxxxxxxxxxxx
Web Site: http://www.rjssoftware.com
Tel: (952) 736-5800
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------------------------------

message: 2
date: Thu, 14 Apr 2011 11:10:55 -0500
from: "Don Cavaiani" <dcavaiani@xxxxxxxxxxxxx>
subject: SMTP non-delivery report

I have a CLP which does a SNDDST (then hands to Exchange Server) - to
occasionally send a fixed message to about 400 Suppliers.

I have run this many times in the past, but now it only seems to be working if I use an Email address of one of our internal Users.

If I now use an external email address, the exchange server message tracking log reports: SMTP: 'Non-Delivered Report (NDR) generated', and no email goes to the external address.

However, email mail routing exclusively thru exchange IS working both ways - inbound and outbound.



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