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From: prj@po.cwru.edu (Paul Jarc)
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Subject: Re: Sender header?
Date: 25 May 2001 12:13:05 -0400
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Harry Putnam <reader@newsguy.com> writes:
> Possibly a bit OT but on the Message-ID part, how big of a concern is
> it that the rhs be a real FQDN  (or is it mailbox?)

It should uniquely identify the host that generated the Message-ID -
but it need not be the host's FQDN.  The point is that there should be
no chance of another host using that same identifier by accident.  If
you control all of domain.com, and you want the host foo.domain.com to
use msgid.foo.domain.com in its Message-IDs, feel free to do that -
just make sure other hosts in domain.com respect that convention.

> I get a little confused about the uniqness issue.  Not really seeing
> how a mail machine name is more unique than some homeboy thing I
> hacked in there (rhs).

If you don't control your DNS domain, you can't ensure that your
convention will be respected.


paul