[ipv6-wg] Real-world IPv6 SMTP experience

* Marco d'Itri:

> On Dec 21, Stig Venaas <Stig.Venaas at uninett.no> wrote:
>
>> I know several sites that have both A and AAAA for all MXs. It doesn't
>> sound safe to me, but I assume it can't be that problematic then...?

> In my experience (linux.it and other domains, IIRC since three years)
> a single MX record with A + AAAA records has not caused deliverability
> errors for incoming nor for outgoing mail. The same applies to a domain
> with A and AAAA records and no explicit MX.

Try to get logs from master.debian.org.  I'm pretty sure they will
show some bounces.  bugs.debian.org (= spohr.debian.org) probably has
similar issues.

Just because you don't know about these bounces doesn't mean they
don't exist. 8-)