Reply to a comment from Jesper Kiaer

My best bet would be: When using MIME, you are the one responsible for the stuff you inside the MIME header, Domino does not care, just sends it off. When you use the "old way" Domino will lookup the person in the NAB, and check whether it should be routed inside the Notes domain (keep the Notes name) or outside (use internet naming format)     

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