[ipv6-wg] Real-world IPv6 SMTP experience

* william elan net:

> On Wed, 21 Dec 2005, Florian Weimer wrote:
>
>> As far as I know, the primary MX needs an A record (to satisfy
>> Sendmail), and there needs to be a MX which has an A record only (and
>> no AAAA or A6 record; this is done to satisfy Exim installations).
>
> Where did you get that exim needs to see at least one MX with ONLY A
> record?

Some of the mail I sent to deneb.enyo.de through an MX running Exim
bounced, and Marc Haber and I figured out that it was due to an
AAAA-masks-A bug in Exim:

<http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20051212/msg00196.html>

Of course, this is a clear Exim bug, and no doubt it will be fixed
soon in the official distribution.  But it will take some time until
this fix is deployed in the field, and in the meantime, I still need
to receive mail from affected sites.