Private IPv6 setting in /etc/mailinabox.conf

[fracai]

I recently configured an additional IPv6 address on my Linode instance. I mostly followed these instructions aside from using netplan instead of systemd.
Anyway, I set the PUBLIC_IPV6 value in /etc/mailinabox.conf, re-ran the configuration and everything seemed fine. Then I got a bounce from Gmail noting that the PTR didn’t match. While I had the RDNS entry in Linode, outgoing messages were being sent on the SLAAC address.

I can manually change /etc/postfix/main.cf and run systemctl reload postfix, but that won’t survive a reconfigure/upgrade.

I found these previous threads with similar issues:

Linode problem with private IPv6 address

Hi, Thanks again for the great product, I cannot say it enough. I like the Nextcloud integration as well, we were even able to easily phase out Dropbox-like services. We are running on Linode, and in order to resolve the “Linode issue” they assigned us a /64 range. I enabled the range on our system and configured this as our “Public IPv6” address. I successfully reconfigured mailinabox. However, even with this change, some remote mailservers still block us with a new error, according to them …

How do I make MiaB use my new IPv6 address?

It still had the old address. Editing it followed by systemctl reload postfix seems to have fixed it. Thank you.

Specifically, the second one mentions editing /etc/mailinabox.conf to change both the public and private entries.

I tried that, but every time I reconfigure with mailinabox or curl …, the configuration file is overwritten and the private address is set to the SLAAC.

Is there something I’m doing wrong or some other configuration that is overriding the PRIVATE_IPV6 setting in /etc/mailinabox.conf?

Thanks for your help.

[fracai]

So it looks like setup/questions.sh respects if PUBLIC_IPV6 is set, but always sets PRIVATE_IPV6.

For now I can remember to update the postfix config manually.

Anyone have any thoughts on if there’s a better way to do this or if the should be a better way to do it?