I have found a small bug.
In the panel you need to select 1 or 2 IPv6 addresses, but I have gotten 5.
That is not a problem, if where it not that Postfix isn't set to those addresses and uses all to send mail out.
In my case this is a problem as only my 2 selected IPv6 have PTR's and the others don't.
It would be nice if the panel would use smtp_bind_address6 in the Postfix main.cf
That way it will respect the Panels IPv6 address(es) and doesn't use the others as well for outbound mail.
Google to name one, will not accept Ip's without PTR.
It will make sure it will only use that IPv6 address(es) for outgoing mail and not select at random.
Can you please change this in future versions.
Thanks,
Bas.