On Tue, Jul 02, 2002 at 10:36:43AM +0100, Matthew Byng-Maddick wrote:
> On Tue, Jul 02, 2002 at 01:17:24AM +0200, Marc Haber wrote:
> > I'd like to point out that one of the uses of domain literals is
> > notifying the postmaster of a site that she is running an open relay.
> > A lot of the DNS block list use postmaster@[IP] to notify a site of
> > being listed.
>
> Actually, the correct thing to do would be to just use
> RCPT TO:<postmaster>
> on the relay box.
>
> Yes, under 2821, postmaster is allowed (as a MUST, I believe) to be
> unqualified.
>
> using "postmaster@[IP]" seems very broken.
Not really. It's fully mandated by the RFCs, and I too, have used mail@[IP]
to reach sites sometimes.
What are you willing to bet that more MTAs accept postmaster@[IP] than
postmaster?
> As a side question, will exim4 allow RCPT TO:<postmaster>, or am I going to
> have to patch it?
Fully supported in exim4 with ACLs. Exim 3, not necessarily, I think some
receipient checks can reject that.
For exim4:
# Accept mail to postmaster in any local domain, regardless of the source,
# and without verifying the sender.
accept domains = +local_domains
local_parts = postmaster
Marc
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