I imagine it could cause problems if not implemented correctly. There is a description of what Sender Policy Framework is and what it attempts to do here: http://en.wikipedia.org/wiki/Sender_Policy_Framework So if the IBM i is configured in DNS with a SPF record, it should work.

But are you talking about the i sending the emails out of the domain directly or relaying through your external mail server? Can you Pseudo diagram the mail flow to clarify?

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