OWA Error

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I get the following error running OWA

HTTP Error 403.6 - Forbidden: IP address of the client has been rejected.
Internet Information Services (IIS)

I have a feeling my problem is in DNS records listed below.

DNS INFO:

Record Name Type Data
mciafserver A 67.84.160.20
mail A 67.84.160.20
mail.domainname.com MX 67.84.160.20 Preference 10
@ MX 67.84.160.20 Preference 21

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