Non delivery reports not being sent out

I have checked my exchange 2003 server and it is set to allow non-delivery reports. I'm getting the reports in my account, but have had complaints that our clients are not aware that their e-mail had been undeliverable. The messages I'm getting show ( in the message options) that the recipient was addressed to receive the NDR. The other issue is the delivery time of the NDR. How long should ti take for an NDR to be generated once a message has been refused. Most of our NDR's are generated from the message having too large an attachment.
The other question I have is , is there any way for the original recipient to know that a message that was addressed to them was not delivered to them, other than me passing on the postmaster e-mails? We are just trying to avoid having clients send mail that they thought we received, but did not.  No one knows so no one respond or acts on the e-mail.
wlamoreAsked:
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cornetthdCommented:
Can you post a copy of the NDR?  Is there message size limits stopping the delivery of messages?
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wlamoreAuthor Commented:
Yes and Yes
            This message is larger than the current system limit or the recipient's mailbox is full.  Create a shorter message body or remove attachments and try sending it again.
            <mail.xxx.com #5.2.3>
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cornetthdCommented:
According to the NDR it is not going to be deleivererd due to the message size.  When and NDR is generated it is returned with the attachment as well.  At this point the size limits will prevent it from being delivered.

There is a way to strip the attachment from the NDR.
http://support.microsoft.com/kb/308303
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wlamoreAuthor Commented:
So, except for the admin  (me) receiving the  NDR, the intended recipient and the sender may not know that the message was not delivered? Looking at the article you reference above, does the recipient as well as the sender receive the stripped message, to let then know a message was sent and not delivered?
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cornetthdCommented:
This should be any NDR sent from your servers strips the attachments.
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wlamoreAuthor Commented:
Thanks. I think this is all I can do. based on the way it seems that an NDR is sent. for the  original sender, (outside our domain) there is no guarantee that they will receive the NDR to realize that their message did no get through. The recipient (in our domain) does not get any notification that someone has attempted to send them an e-mail that did not get delivered. I, being the administrator, am receiving the NDR's and have to notify the intended recipient, that they may have to contact the sender to let them know to send again, only smaller.
Does this make sense, or am I missing something?
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