Submitting Outbound Mail via IPv6

[Seth]

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.

Limitations:
* 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]

Logging for outbound mail now includes IPv6 source addresses.

[candrews]

Are you planning on setting up an address with both IPv4 and IPv6 DNS entries? Currently, my IPv6 connection is a bit unreliable, and since postfix can only use 1 relayhost, I'm forced to use "smtpauth.rollernet.us" - but if there was another name that had both entries, postfix could seamlessly fall back from IPv6 to IPv4 when the IPv6 connection to the Internet is unavailable.

[Seth]

I can add an A record to smtpauth6.rollernet.us . The only reason I didn't was to force IPv6.

[Seth]

An A record has been added to smtpauth6.rollernet.us to allow dual-stacking.

Code: Select all

$ host smtpauth6
smtpauth6.rollernet.us has address 208.79.240.5
smtpauth6.rollernet.us has IPv6 address 2620:0:950:f000:213:72ff:fe4f:6a76

[Seth]

The IP address for smtpauth is changing to: 2607:fe70:0:3::d

[Seth]

The mail logs now support IPv6 CIDR searches.