Hi,
sure, not much IPv6-enabled SMTP servers already around the world but
the number will hopefully grow in the future.
And because spammers always found a way to send e-mails I think
something like ordb or similar should be extended for IPv6, too.
Two cases should be catched:
1) 6to4 addresses
Two possiblities
a) extract the IPv4 address and check them against current IPv4-only
databases
b) see next
2) other global addresses
check against an IPv6-enabled database, which should have the
capability to block full /64 or lower prefix lengths and use a
positive list.
Blocking networks is is hard, but otherwise a spammer could easily
change his client address (possibility ~ 2^46 minor reserved ones
using EUI-64 based IID).
Comments?
If this would be also an interesting issue for maillist "ipng", pls.
forward.
Peter
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