Bug#307768: exim4: check_local_user should reject system users?

[Marc Haber]

On Sat, May 07, 2005 at 11:54:19AM -0400, Marc Sherman wrote:
> Marc Haber wrote:
> >But the real-* business has been in the exim packages for a _very_
> >long time (this is even part of exim3 on woody) and probably nobody
> >knows any more why we include this. Does upstream recommend this in
> >its default config, or is this a Debianism?
> 
> The use of real-* comes straight out of the upstream docs for 
> skip_syntax_errors:
> http://exim.org/exim-html-4.50/doc/html/spec_22.html#IX1867

The Debian packages have had real-* for _much_ longer than that.

> In those docs, it does recommend that the real-* router be put 
> immediately above the userforward router.

I suspect that Debian introduced the real-* stuff way before Philip
wrote that.

> While the real-* router in the docs doesn't do any of the local-sender 
> only verification that I propose, there is a strong implication there 
> that the only reason to have the real-* router is to handle syntax 
> errors in userforward, not for arbitrary third-party usage.

No, that implication is definetely wrong, the real-* stuff was already
handled by exim 3.12 back in 2002 (which is the oldest exim package I
could get hold of), while we introduced the syntax error handler in
userforward somewhere in the 4.x era.

> I'm not subscribed to those lists, but you're welcome to repost this 
> thread (or just a reference to 307768, which should have all the 
> discussion) there if you like.

Hey, it's your job to convince me ;)

Anyway, both lists don't have much traffic so it doesn't hurt to be
subscribed. You are a very active user of the packages, so I think
that you should be there.

Greetings
Marc

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