Is smtp mail ever likely to switch to IPV6?
Eventually, sure. Some time in the next decade IANA will allocate the
last available /8 to the RIRs, and IPv4 space will get a lot more
expensive.
We'll probably start seeing v6-only hosts in Asia first, and people
will upgrade depending on the pain level of being unreachable from
those places. Given that most Americans are barely aware that Canada
exists, much less countries in Asia, I imagine it'll take a while. I
also expect formal and informal v6 to v4 gateways to spring up, with
all of the spammy excitement of any third party gateway.
Most network equipment shipped these days can handle v6, so when you
finally switch over, it's just going to be a config change.
R's,
John
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