Vernon A. Fort wrote:

so I could see what part of the header was invalid.  There was/is a line:

   Message-ID:

with nothing after the line. I removed the line and re-sent the message successfully. Why would single line called Message-ID: cause lmtpd message header errors?

Because it's invalid syntax according to the RFCs. A header name must be followed by a value, otherwise it cannot be present.
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