If you're feeling brave and have IPv6 connectivity, you can now submit mail to our Outbound Mail service (SMTP AUTH) over IPv6 by connecting to "smtpauth6.rollernet.us". All of the same ports and TLS available under IPv4 also apply as we have simply dual-stacked the service. I've sent a few messages myself without any problems and the AUTH server itself has been able to connect to IPv6 enabled destinations for many months now.
* No support for the "Permit IP/Host" feature (this will be corrected shortly)
* No DNS A record for smtpauth6.rollernet.us
* Logging is currently being updated to include IPv6
As far as I'm aware, we're one of the very few - maybe even the first - provider in our arena to enable IPv6 for transport-level SMTP. This is quite a bit more substantial than simply making a website IPv6 available, so please send us feedback.
Seth Mattinen, Roller Network LLC