[Asrg] Question on Message-ID

["william(at)elan.net" <william at elan.net>]

I have a somewhat quick question needed for the draft I'm starting to write.
I want to know if in the current mail practice Message-ID is ever changed 
when email is in transit, i.e. do intermediate MTAs ever enter their own 
new Message-ID. By intermedia MTAs I mean absolutely any MTA in any 
complex email path, including maillists, forwarders, normal relays, 
anti-spam firewalls relays, etc.

If Message-ID is changed, can somebody provide me example as far as which 
software does it and how this practice is. 

Related question is if bounced emails autogenerated by MTA software ever 
have same Message-ID as original email, if so which MTAs use this 
practice and how common is it?

-- 
William Leibzon
Elan Networks
william at elan.net


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