Email not received from NBX 100

Attempting to set up our NBX 100 system to deliver emails with .WAV attachments for voicemail notifications. I have everything setup properly however, I  recieve the following email when I get a voicemail.

The mail NBX Message Notification coming from nbx@mycompany.com can not be transmitted to you because it contains an attachment prohibited by our security policy.

I can manually create an email, attach a .WAV and send/recieve with no issues so there is no blocking of that file type.

Any ideas on how to resolve this issue?

Thanks in advance!
GambleSolutionsAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Do you have a recieve connector setup on Exchange or are you using the Unified Role?
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GambleSolutionsAuthor Commented:
I'm not sure. How do I check?
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brinkdg33Commented:
Your server is blocking .wav files.  If you want to verify this, send one of the messages directly to a third party mail account like gmail.

Check out the multitude of options that might be trying to inhibit spam - http://www.microsoft.com/exchange/2010/en/us/exchange-2007-features.aspx

It will work once your email filter will let it through.
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GambleSolutionsAuthor Commented:
brinkdg33,,,,, I've tested this and have no problem sending or receiving WAV attachments.
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GambleSolutionsAuthor Commented:
After exhaustive troubleshooting it turns out it was being blocked by a firewall.
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GambleSolutionsAuthor Commented:
Discovered the solution on my own.
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