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From: Per Abrahamsen <abraham@dina.kvl.dk>
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Subject: Re: Thoughts on Message-ID generation
Date: 03 Mar 2001 11:45:20 +0100
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In-Reply-To: <87snkxqico.fsf@deneb.enyo.de> (Florian Weimer's message of "01 Mar 2001 22:39:35 +0100")
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Florian Weimer <fw@deneb.enyo.de> writes:

> prj@po.cwru.edu (Paul Jarc) writes:
> 
> > Florian Weimer <fw@deneb.enyo.de> writes:
> > > For mail, there never was a uniqueness constraint on message IDs.
> > 
> > I'm not sure what you mean, but RFC822 4.6.1 says "The uniqueness of
> > the message identifier is guaranteed by the host which generates it."
> 
> Hardly anybody relies on the uniqueness of message IDs.  

How is that relevant?

I do, anyway, since I use the message-id for sorting away duplicates.
Someone else mentioned threading, and mail-to-news gateways also rely
on the uniqueness of the mail message-id.

> Messages without IDs are even transported by most MTAs.

I believe sendmail adds one if it is missing.