Re: Email over v6

[Jared Mauch <jared () puck nether net>]

On Jul 8, 2010, at 2:21 PM, Dan White wrote:

> On 08/07/10 19:04 +0200, Mikael Abrahamsson wrote:
> > On Thu, 8 Jul 2010, Brielle Bruns wrote:
> >
> > > By default, at least on Debian, TLS and IPv6 (if available, even if only using link local addresses) are on by 
> > > default, so there's not too much that needs to be done to use TLS on the SMTP side.
> >
> > TLS wasn't enabled on my Debian using Postfix, so I guess it depends on  more factors than just "running Debian". 
> > IPv6 seems to be on by default,  yes.
>
> I can confirm that STARTTLS was enabled out of the box on my Debian unstable
> system... using the snakeoil cert of course.
>
> IPv6 (port 25 incoming) was not enabled out of the box. I needed to add
> "inet_protocols = ipv4, ipv6" to enable it.

I figured I would share actual data for everyone here, roughly 1:4.22 messages that are handled by my system go over 
some sort of IPv6 transport.

(excluding connections from itself-to-itself.. i should make these be IPv6)

puck:~> grep sm-mta /var/log/maillog | grep IPv4 | grep -v 204.42.254.5 | wc -l
   22696
puck:~> grep sm-mta /var/log/maillog | grep IPv6 | wc -l
    5371

The technical community lists are good fodder for this data.  (eg: nanog, *-nsp) 

I do wonder if gmail.com gives out AAAA addresses for their MX, and the same for other mail solutions.

This seems like something that is a no-brainer for me, as latency on email isn't a big deal where for HTTP transactions 
it can be.

- Jared