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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Despamming wholesale dialup
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 > > [email protected] > > -- > ��4i1� > >
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