Exchange 2003 Distribution Group can't receive external email

In my research the only thing I can find that would disallow this is the Message Restrictions section and I believe having it set to "From Everyone" is correct. Appreciate any help anyone would have.

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fairtechAsked:
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Tej Pratap Shukla ~DexterServer AdministratorCommented:
hi,
                   This isuue can be solved by following the steps mentioned in the url.

http://enterpriseit.co/office365/distribution-group-not-getting-outside-emails/
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fairtechAuthor Commented:
Thanks Dexter_morgan, but we are using Exchange 2003 not Office365.
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fairtechAuthor Commented:
Issue was with our Firewall
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fairtechAuthor Commented:
Issue was with our Firewall
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