Hi,
Based on my understanding, Exchange 2003 receives Lotus messages and you want to send Lotus mails out via Exchange 2016?
Perhaps you can create a Dedicated send connector to send message from Exchange 2003 and Exchange 2016. I can't think of other methods. And honestly, Exchange 2003 is too old to supported, we strongly suggest to upgrade Exchange 2003 to Exchange 2010
as soon as possible.
Best Regards,
Lynn-Li
TechNet Community Support
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