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1160 | Chapter 25: The H (Headers) Configuration Command
Also note that you should never try to replace an existing Message-ID: header with one of
your own. This could result in the loss of important information needed to trace the origin
of a message (but see also ?§25.6.1 on page 1139).
As of V8.13, an mc macro makes it mucheasier to define a new value for the Message-Id:
header:
define(`confMESSAGEID_HEADER??, `newvalue??)
Here newvalue is the address part for the header. Be sure the newvalue address part is
enclosed in angle braces because sendmail will not add them if you omit them.
As of V8.13, when a Message-Id: header is found in the message, sendmail assigns its value
to the ${msg_id} defined macro (?§21.9.68 on page 834).
25.12.25 Message:
Marks end of headers sendmail
The Message: header is used to mark an early end to a mail message??™s headers. When sendmail
finds this header, it immediately stops gathering the message??™s header lines and treats
the rest of the header as the start of the message body. This header is useful for including
non-Internet headers in the header portion of a mail message. For example:
To: george@wash.dc.gov (George Washington)
Subject: Re: More text
Date: Sun, 6 May 2001 17:32:45 EDT
Message-Id: <200105061723.
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