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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