Re: [Asrg] Question on Message-ID

[Richard Welty <rwelty at averillpark.net>]

On Wed, 9 Jun 2004 04:40:32 -0700 (PDT) "william(at)elan.net" <william at elan.net> wrote:
> 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 you haven't already read RFC2822, 3.6.4, you really should do so
before writing any more of your draft.

be aware that Message-ID is a SHOULD, not a MUST, and many MUAs
do not generate one, leaving it to the first MTA that's paying attention to
put one in.

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

it's not supposed to be done, but some MTAs reportedly do this. i don't have
any examples for you. there is langauge in RFC2822 3.6.4 that specifically
addresses this.

> 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?

now this shouldn't happen. a bounce is a new message, originating at at
the bouncing MTA. if it does, it's definitely out of conformance.

richard
-- 
Richard Welty                                         rwelty at averillpark.net
Averill Park Networking                                         518-573-7592
    Java, PHP, PostgreSQL, Unix, Linux, IP Network Engineering, Security


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