Re: [Fwd: Re: Spamassasin over RBL, was Re: rblsmtpd -t?]
On Wed, 8 May 2002 04:09, Jason Lim wrote:
> > > is not foolproof either... unlike your "everything is black and white"
> > > stance.
> >
> > If you can send a cryptographically signed message is to a mail server
> > outside your network and addressed to a machine in your network, if you
> > receive it at it's destination and the crypto sign matches then you know
>
> it's
>
> > an open relay.
>
> Note that I said "one of the tests". There are certainly a whole number of
> ways to confirm that a mail server really is relaying mail. But I know
> some RBLs only employ the most rudimentary of tests.
>
> Naturally, the way you suggest above will provide absolute truth. But do
> all the RBLs employ this method? That was the only point I'm trying to
Probably not. DNSBL's that don't test as well probably shouldn't be used.
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