Invalid Header

[Vernon A. Fort]

My setup is FC3 with postfix + cyrus-2.2.10-3.  I had several messages 
in the queue stating "Invalid header".  After searching for hours, I 
attempted to save the message using postcat
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?

Please point me to some RFC or documentation.  I need to present to the 
higher-UPS a decent explanation on why this message took 6 hours to get 
delivered.

Vernon
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