EXPERT RESPONSE
From the short description you've provided, I'd start by looking at the MX record in the public DNS for your company. Make sure it's pointing to whatever public-facing IP is associated with your Exchange Server, and not to your old POP server.
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Related information from SearchExchange.com:
Expert Advice: SMTP domain and email address setup
Expert Advice: Setting up Exchange Server to handle outside mail
Tutorial: A primer on DNS and MX records
Reference Center: Microsoft Exchange and DNS resources
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