Configure Exchange to receive email from an internal address with an external IP address

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http://serverfault.com – Our company provides email marketing services. Our service is hosted and emails are deployed from our IP addresses. Clients use their email address(es) as the "from" address, and typically, as long as they have the SPF record in place that includes our IP addresses, there isn't a problem with deliverability. We have one client that cannot receive emails deployed from our IPs on their internal network when one of their company addresses is the From address. The client is using exchange 2010. Example: Client deploys an email to recipient: [email protected] From our server (and IP) using their (HowTos)