ISPs blocking SMTP connections from dynamic IP address space

Jez Hancock jez.hancock at
Thu Aug 7 09:54:54 PDT 2003

On Thu, Aug 07, 2003 at 11:23:53AM -0500, Doug Poland wrote:
> On Thu, Aug 07, 2003 at 04:14:28PM +0100, Jez Hancock wrote:
> > Actually I think there was one reply that mentioned a lot of
> > netblocks that were being included.  If it's the case that those
> > netblocks are admin'd by companies that do not (pro)actively attempt
> > to block spam then I agree they should be blocked.  Presumably the
> > larger companies you mention have researched the amount of spam
> > trapped at their mail gateways over time and are sick at the fact
> > the numbers haven't dropped over time despite complaints to the
> > spammer's admin contacts.
> > 
> To quote Time Warner: 
> 	"As part of this continuing effort, Road Runner, along with a
> significant number of other providers, has implemented incoming port
> 25 blocks of dynamically assigned IP address space, including dialup,
> DSL, and Cable modem IP addresses. The reason for this is because of
> the widespread number of high speed subscribers who we have found are
> infected with trojans such as Jeem, or have open proxy or SMTP
> applications which allow third parties to hijack them."
> > 
> > > Is anyone else uneasy with this trend?  Maybe it's just me and I
> > > don't like being discriminated against because I don't have the
> > > money to own static IP addresses.  One would think groups of
> > > responsible and technically competent users would be organizing
> > > against this trend and attempting to make their voice heard.
> > I don't think I am uneasy about this - but then again I'm not on a
> > blacklisted netblock!.  Having said this though, if I found my
> > bandwidth provider was on a blacklist and had no intention of
> > attempting to get off it I'd probably move straight away anyway.  --
> >
> Not everyone has multiple broadband providers to choose from.
Fair enough and I can understand your annoyance in that case.  What do
your providers have to say about all this?  As a customer I would be
very angry about it and can't imagine I'd be alone since the blocks
mentioned are quite vast.

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