> On Tue, 28 Jul 1998 patl@??? wrote:
>
> > I've recently noticed some UCE/UBE arrives without a Message-Id:
> > header, or with one from an intermediate site. What would be the
> > best way to configure Exim 1.92 to reject any incoming message
> > which has a Received: header but no Message-Id: ?
>
> Exim (like many MTAs, but not all) adds a Message-Id to messages that
> don't have them. You can detect this by putting something like this in a
> system filter file
>
> if $sender_host_address is not "" and
> $h_message-id contains $primary_hostname
>
> but of course that test is not 100% reliable since the message may have
> gone out from your system and come back (mailing list expansion or
> forwarding). The contents of the message-id added by exim are
> configurable; you could arrange to add some magic text only in the case
> of incoming remote messages without message ids. That would make things
> better.
That still doesn't quite do what I was looking for; but I think
you obliquely answered my question. (The answer being: 'Do it in
a system filter'.)
> However, since such header lines are optional, I don't think this test
> is actually going to work, and I would advise against implementing it.
You are right. My mistake was in thinking that Message-Id was
required. Since it isn't, there isn't much point in trying to
filter on it.
-Pat
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