Exchange 2010 - NDRs not being sent to External Senders

I think I might not understand this concept, but here goes.

I've set up my postmaster and ExchangeRecipient and NDRs correctly, so that I get a copy of all NDRs to internal recipients.

When an external sender tries to send a message - for example larger than the allowed receive size - I get a proper NDR notification.  However, the sender is not getting any bounce notifications.  Is that the job of the sender's e-mail server or our Exchange Server ?

As an example, I sent a 15MB attachment to a test internal recipient from my Google Gmail account. Our size limit is 10MB. On the inside, all works perfectly. However, I never receive a notification from Google that my message has bounced.  Is that a Google issue or is that a configuration issue on my server ?  (Exchange 2010, SP2, RU4).

Thanks much.
-Stephen
lapavoniAsked:
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lapavoniAuthor Commented:
OK, figured it out.  Enabled NDR reports under Remote Domains

Organization Configuration
Hub Transport
Remote Domains
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lapavoniAuthor Commented:
I found the solution to this after searching for quite a while.
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