> IPv6 makes publishing IP address reputations impractical.  Since IP address 
> reputation has been a primary method for identifying abusive sources with 
> IPv4, imposing ineffective and flaky > replacement strategies has an effect 
> of deterring IPv6 use. 

In practice, the /64 prefix of the IPv6 address has very much the same 
"administrative" properties as the /32 value of the IPv4 address. It should be 
fairly straightforward to update a reputation system to manage the /64 prefixes 
of IPv6. This seems somewhat more practical than trying to change the behavior 
of mail agent if their connectivity happens to use IPv6.

-- Christian Huitema



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