ISPs blocking SMTP connections from dynamic IP address space

Dan Nelson dnelson at
Wed Aug 6 10:26:55 PDT 2003

In the last episode (Aug 06), Bill Campbell said:
> On Wed, Aug 06, 2003 at 11:19:57AM -0500, Doug Poland wrote:
> >Within the last two months both AOL and Time Warner Road Runner have
> >implemented port 25 blocks from hosts with IP addresses in the
> >"dynamic address space".  Time Warner claims other major ISPs
> >are/will be implementing the same policy.
> >
> >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.
> For every *bsd/Linux/Unix user who has enough clue to run servers
> properly, there are thousands of clueless folks who connect their
> Microsoft Windows viruses directly to the Internet where they're
> subject to abuse from the outside world.

Right;  I've blocked most broadband domains and bouce an awful lot of
spam.  In the last 12 hours, I've blocked 121 spams this way (about 10%
of the total blocked spam).  I don't block by IP range, just domain;
emails from people that have set up forward and reverse DNS pointing to
their own domain pass right through.

Whenever a customer complains, I point them to their ISP's help pages. 
For example, business RoadRunner users should be relaying their outgoing
emails through, according to

	Dan Nelson
	dnelson at

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