In a message to rowan crowe 
Mark Kimes  wrote:

 >         ^AMSGID: origaddr serialno

 >    The originating address should be specified in a form that
 >    constitutes a valid return address for the originating
 > network.

 rc>> If you are pulling address information out of it, then your
 rc>> software is broken.

 > That's funny, there's usable address information in the address
 > in the MSGID in your message.

Not always.  You cannot assume this - if you do you run the risk of
attempting to obtain addressing information in a format unknown to your
software.


                       ^^^^^^^^

This is where the "usable address information" is.

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