[mso] outlook rejection

One of the workers here sends group mail to his pupils. Suddenly (in the 
past few days) he has been getting a rejection notice.  His letters were 
sent but returned in a list with the following message:

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

Subject:  The subject he used

Sent: Date and time stated

The following recipient(s) could not be reached:

John Doe on - date and time mentioned above specified

452 4.5.3  Too many rejections; try again later

Every person on his group list is then  listed in the same way and he 
gets a long list of names with the format described above for "John Doe".


If he sends the same message to the same list from Outlook Express, no 
problem. My obvious conclusion is some configuration in Outlook causing 
this. The Outlook is NOT via Exchange.

Any Ideas?

Errol




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