RE: [MLUG] More spam

["Russell Horn" <EMAIL:PROTECTED>]

> -----Original Message-----
> [mailto:EMAIL:PROTECTED]On Behalf Of Spurling, Shannon
>
> No, reverse lookup only gives you the record you requested, if it exists.
> The reason you can't do what is given below is that it is
> completely plausible that the mail might go through some sort of
> relay machine, or be hosted on some sort of virtual mail hosting
> box. In fact, the current practice of checking for a registered
> reverse DNS is a violation of some of the RFC's that govern SMTP
> regulation. Now RFC's are only recommendations about how a
> protocol should work, but they are carefully thought out in order
> to ensure compatibility and no following them can cause major
> problems. It clearly states that SMTP connections from hosts that
> identify them selves by IP are supposed to be accepted. I can't
> remember the number off the top of my head, but it was the
> current RFC that I was looking at. We were looking at it because
> of some disagreement about how smtp can be filtered. It was
> pretty interesting.
>

Another interesting thing from the RFC is that you have to be able to
disable your filtering on the postmaster account, as mail directed there
should be accepted no matter what.

I've encountered this before where over harsh filtering has stopped my mail
getting through, but when I email postmaster@ I find my mail rejected for
the same reason.

IRC EMAIL:PROTECTED has an interesting interpretation on this - they
accept mail to it, but reply with an automatic response and don't direct you
to a human, so if you're having difficulty delivering to hotmail, microsoft
say 'tough'.

Russell.

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