Exchange 2010 NDR

Senders are not receiving NDR's from Exchange server 2010 for attachment size violation only.  All other NDR's are being received.  Seems strange that all NDR's are working except for the attachment size, I would expect it to be an all or none deal.
zoosysopAsked:
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zoosysopConnect With a Mentor Author Commented:
Missed a firewall setting, so large attachments were not making it to the mail server.  Set the firewall message size well above the mail server setting and now NDR's are being sent.
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Sushil SonawaneCommented:
Make sure the NDR setting for the default remote domain is Allow NDRs ticked (Org Config -> Hub Transport -> Remote Domains -> Default -> Message Format).
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imkotteesSenior Messaging EngineerCommented:
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suriyaehnopCommented:
Is happened for Internal or External sender?

If external sender, do you have deploy mail gateway between internet and exchange? Maybe the outbound/inboud limit at mail gateway level cause the exchange didn't receive the incoming mail then cause NDR not generating
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zoosysopAuthor Commented:
The firewall smtp proxy had an attachment size limit that was overlooked.
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