Even if I wanted to do this, I don't think I could take the performance
hit running an access list that large on my incoming ports would create.
I think in order to be able to handle that kind of filtration, he must
be an insignificant smaller provider. A larger provider doesn't have
the spare cycles in the router to handle it.
Owen
Yes, it's be much easier to just filter smtp from 38/8.
I don't think anyone with customers could actually do it, though...
And Interramp customers would eventually figure out that just about
any SMTP server out there can be used as a reflector.
Better, I guess, to continue pressuring PSI to eliminate the scum.
But aren't Interramp customers now owned by Mindspring?
Avi
The transition has not yet occurred; we will start transferring customers
come the beginning of September.
And we like to think that we have a good policy concerning spam. 
(mailto:abuse@mindspring.com with any complaints; they all get answered.)
lists@reflections.mindspring.com writes:
The transition has not yet occurred; we will start transferring customers
come the beginning of September.
In addition, we will not be offering free demo accounts. The ease
with which spammers can acquire throwaway PSI accounts, coupled with
PSI's inability to trace a given post back to its source, has made PSI
a spammer's dream. It's not a matter of apathy, but of impotence.
Those in charge of curtailing net abuse had few of the facilities
necessary to do so.
We will require NNTP authentication for news posting, and will
immediately take action against accounts whose postings violate our
terms of service (http://www.mindspring.com/aboutms/policy.html).
-- Robert