Re: [Asrg] Question on Message-ID

[Richard Welty <rwelty at averillpark.net>]

On 9 Jun 2004 17:48:40 -0000 John Levine <asrg at johnlevine.com> wrote:

> >> 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.

> qmail's bounces have no Message-ID at all.  This is arguably wrong,
> but it's been like that since 1998.

well, because Message-ID is a SHOULD rather than a MUST, qmail is
just barely in conformance. on the other hand, an MTA that generated
bounces using the same Message-ID as the original message would
clearly be beyond the pale.

> Many MTAs (s*ndm**l) will add a message ID on the way through even
> to mail that didn't originate locally.

that's a configurable option with exim. since so many MUAs don't
generate Message-ID at all, it's not unreasonable for the MTA at
the point of injection to add one when it handles a message that
doesn't have one already.

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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