On Wed, 30 Oct 2002, Alan J. Flavell wrote:
> A topic that's come up a few times lately with us is how to accept
> mail from 'good guys' who are registered with dyndns.org when their IP
> is in a range that's otherwise blacklisted as a spam source.
Tell them to relay through their ISP's mail servers. That's what they're
there for. There aren't a lot of alternatives I'm aware of, unless you
write a script which takes HELO data (I don't even know if you can get a
hold of HELO data in Exim), does the forward lookup, and compares that with
the originating IP address - but only does so for dyndns.org addresses.
For extra credit, restrict such lookups only to certain dyndns.org
subscribers - after all, we don't know who's got subdomains there, possibly
there are some spammers lurking in the deeper corners.
But using their ISP's mail servers to relay is the correct answer. I can't
think of any reason not to do so, short of gross incompetence (in which
case, a new ISP would be called for).
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Matthew Palmer, Geek In Residence
http://ieee.uow.edu.au/~mjp16
