Customize NDR message for 5.2.3 - email too large to receive

[Tammy]

Hello,

We are running SBS 2003 SP1 so Exchange Server 2003 SP2.

I have the following mailbox sending/receiving limits set-up:

Global: 15MB for both
SMTP Connector: 15MB

It is my understanding that the SMTP setting uses the global setting for
incoming Internet emails so I set it to 15MB because some users need that
15MB. I then changed all users individual mailboxes to 5MB and set those who
need more to 15MB. It seems to be working. I only mention this because it
took a lot of reading to sort out the best way to accomplish this - to
basically allow only a few users to receive external emails up to 15MB in
size. If anyone has a suggestion for a different way of doing this that
would be great!

Now that this works we just want to know if there is a way to customize a
non-delivery message for Internet emails coming in that are larger than 15MB
in size. Right now they just get this message:

This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
error code is 5.2.3

We would like the message to say that the email was rejected because it
exceeded the size allowed. I see this when sending emails to certain
Internet email addresses - I know it's specific to how their email server is
set-up - just want to be able to do on our server. I was told this is hard
coded into Exchange but to try using eventsinks but have no idea where to
start with that!

Thanks so much in advance for any assistance provided.

Tammy

[Tammy]

Sorry - I meant to also ask if there is a way to speed up the delivery of
the NDR message. For example, when testing the issue below, an external user
will not receive the NDR email (which we're hoping to customize) until
several hours later. This can be quite frustrating because if they received
the NDR right away, indicating that the message size is too large, they can
simply make the attachments small and try again.

Thanks again!
Tammy