From: spamassassin-talk-admin@lists.sourceforge.net  Mon Aug 26 16:47:05 2002
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Subject: Re: Whitelisting (Re: [SAtalk] SA In The News)
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To: Bart Schaefer <schaefer@zanshin.com>
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There is a whitelist RBL now!  Ironport's Bonded Sender is 
basically a whitelist RBL where you post a bond to get on the 
list, and then lose the bond if you end up spamming from that IP 
address (or something like that).  http://www.bondedsender.org/

C

On Sunday, August 25, 2002, at 07:58  PM, Bart Schaefer wrote:

>> 4. DNSBL: Only certifies an ip address, not who is using it. As it is
>> currently used, DNSBL allows you to look up if some IP address 
>> has been
>> blacklisted by someone. What I haven't seen is a service that 
>> provides a
>> DNS based whitelist.
>
> There's a practical reason for that:  Any DNS list (white or 
> black) works
> only for a limited number of IPs; the set of unlisted IPs is 
> much larger
> than the set in the DNS list.  If you have to make a binary decision to
> accept or reject, you'll be wrong less often if you reject the 
> blacklist
> and accept everything else, rather than accept the whitelist and reject
> everything else.
>
> A whitelist is only helpful when (a) you only want mail from a limited
> number of known sources, or (b) you can use a secondary system 
> like SA to
> decide what to do with the vast unlisted masses.  Most MTAs still make
> only the binary decision, because the secondary computation is 
> expensive.
>
> With SA's cooperation, though, it might be worth a try.  Even better if
> one could get commercial anti-spam outfits to agree to factor it in.



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