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Re: [Asrg] Implementing IPv6 DNSBLs

2010-11-28 09:38:01
Accepting mail only from IPv4 will be the norm and will not result
in any lost mail, even far into the future.  Devices with only IPv6,
such as smart phones and desktops will send mail through smarthosts
with IPv4 connectivity.

Make up your mind: if a v6-only device smarthosts, the smarthost must
be accepting mail from v6.

Perhaps you meant accepting _arm's-length_ mail from v4 only?  It's an
important distinction, in that it means, for example, that leaving v6
support entirely out of genera-purpose SMTP listener implementations
would be a Bad Thing.

I wouldn't disagree, even though steam comes from the ears of the
IETF old guard when one points this out.

I think I at least partially disagree.

If the big receivers (gmail, hotmail, mail.com, etc) don't take mail on
v6, spamware is unlikely to bother; if this happens, it means that
coming in over v6 correlates negatively with being spam, leading to a
spam advantage for accepting v6 mail for small receivers.

And if the big receivers do take mail on v6, I don't think it will be
fair to say that accepting only over v4 is "the norm".

At the moment, we seem to be in the former of those situations.  Almost
all the v6-carried spam I get these days comes through mailing lists
hosted on dual-stack hosts.

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