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blocking dialups

At this moment I see most UBE coming directly from dialup

First, I think the ISP's should filter their dialups so they have
to relay through the local mail relay.

Until then, I would like to block all dialup/ppp ip's.
They are easy to find.

The problem: How can I know when those ip's get allocated
for something else?

Is this an idea for yet another kind of rbl? Or does
it already exist?

Med venlig hilsen / Regards 
Netdriftgruppen / Network Management Group

Tlf./Phone   +45 35 87 89 41        Mail:  UNI-C                                
Fax.         +45 35 87 89 90               Bygning 304
E-mail: torben.fjerdingstad@localhost       DK-2800 Lyngby

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