From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2004-10-27 22:40:51
On Wed, Oct 27, 2004 at 09:49:19AM -0700, Cameron Kaiser wrote:
> > > MagerValp, would it be possible to reject messages sent with a
> > > forged HELO or EHLO address?
> >
> > Unfortunately not, the virus scanner server is rather braindead.
> > There's also quite a bit of legit mail that doesn't have a HELO
> > address that matches its reverse DNS lookup.
>
> Me, for example (floodgap.com reverse resolves to a DSL Extreme subscriber
> IP).
However, if you follow the chain of MX or CNAME records for floodgap.com,
you will get to an A record that matches your IP address, won't you?
There's no need to do reverse DNS lookup. It wouldn't work for any web hotel
hosted domains (like many small businesses), or domains run behind a
DSL connection (like yours). I wonder why a few years back some sites
insisted on a successful reverse DNS lookup before allowing connections.
Didn't WHOIS work for IP addresses back then?
Marko
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