[Operators] server reputation

Jesse Thompson jesse.thompson at doit.wisc.edu
Fri Apr 18 14:08:02 CDT 2008

Luke -Jr wrote:
> On Friday 18 April 2008, Jesse Thompson wrote:
>> In the email world, public whitelists aren't all that popular.
>> Blacklists are.  A server is in effect whitelisted if it isn't on any
>> blacklist.  I would suggest blacklisting as a first step.
> I would argue that the DULs are public whitelists since they "list" a large 
> majority of active IP addresses indiscriminately, and are unfortunately quite 
> popular.

"DUL" as in Dynamic Host List?  With some exceptions, it fairly safe to 
block non-authenticated email (and XMPP s2s as an extension) from 
dynamic hosts.  I'm not sure why that makes it a whitelist.

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