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550 5.7.1 Requested action not taken: message refused
Mike;You were, of course correct.The Exchange Server has Microsoft's seemingly un-ironically named Intelligent Message Filtering installed. Microsoft apparently changed the way that they evaluated email in one of their updates. The new algorithm interpreted an invite as SPAM and rejected it, while allowing the email alerts to relay.Dialing the level of filtering back, allowed the invites to be relayed. How much extra SPAM allowed through the filter is to be seen.