Re: How to: Change Message-ID header.

"[email protected] [blat]" <[email protected]>
Newsgroups gmane.mail.blat
Message-ID <[email protected]>
A Message-ID is two parts, left and right separated by an "@".
The left side must be unique. 
The right side is the hostname, domain name, or domain literal IP address.

In the case of Blat -- the left side consists of DateTime, "Blat" and version, PID and CPU time -- the right is hostname or server.

SMTP servers may change the original MID of a message.

The right side may be changed via command line, config changes, etc.
The left side would require code changes (see bldhdrs.cpp).
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