Despamming wholesale dialup
scott w
scott at digisle.net
Fri Oct 30 19:08:56 UTC 1998
http://www.brightlight.com/
On Fri, 30 Oct 1998, Henry Linneweh wrote:
> NEW SOFTWARE, NOT CONGRESS MAY STOP SPAM
> (Source: PC World Online) If you're sick of being deluged with
> junk e-mail, don't look for relief from Congress, where only one
> pending bill is even close to passage.
> http://www.idg.net/go.cgi?id=34539
>
> hmm this may be an option worth looking into....
>
> Henry R. Linneweh
>
> Bryan Bradsby wrote:
>
> > On Fri, 30 Oct 1998, Phil Howard wrote:
> >
> > > These are actually two separate issues:
> > >
> > > 1. Open SMTP relays
> > >
> > > 2. Dialup ports open to all SMTP servers
> > >
> > > While these two issues do interact, and a perfect solution to one of them
> > > makes the other much less of an impact, they do both need to be addressed
> > > as distinct issues.
> >
> > Exactly.
> >
> > Attempting to assist responsible netops in closing their open relays
> > addresses issue #1. Send them a respectful, helpful and friendly note.
> >
> > I would like to discuss item #2. See below.
> >
> > > > But my question is - Would responsible netops be willing to give me a list
> > > > of their (non-relaying) SMTP servers?
> > >
> > > I'm curious what such a list would be used for. Would you limit access to
> > > just those SMTP servers?
> >
> > Exactly. I would open up port 25 incoming for responsible (not an open
> > relay) SMTP servers. Thus real customers could send their legitmate mail.
> >
> > Block port 25 (only) from all "open modem banks" (TM) to my SMTP servers.
> > If implemented on a large enough scale, the modem user will be
> > 'encouraged' to use the SMTP server supplied with their account. Make each
> > dialup customer go through, and be authenticated by their own SMTP server.
> >
> > Each OMB filter will most likely be a /24 or larger block of IP addresses.
> >
> > The logic is simple. There are more modems than SMTP servers. Block port
> > 25 from the OMBs, open up for corresponding (responsible) SMTP servers.
> >
> > Either an operator directs (by filter) port 25 on his modem banks to his
> > SMTP servers, (preventing OMB), or we do it for him. The intent is a
> > convergence on a suggested Best Practice.
> >
> > > Would that not form a rather long access list?
> >
> > Perhaps for a router or firewall, but not for a sendmail access.db.
> >
> > > -- *-----------------------------* Phil Howard KA9WGN * --
> > > -- | Inturnet, Inc. | Director of Internet Services | --
> > > -- | Business Internet Solutions | eng at intur.net | --
> > > -- *-----------------------------* philh at intur.net * --
> >
> > -bryan
> > abuse at capnet.state.tx.us
>
> --
> ¢4i1å
>
>
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