I am not sure if this issue is specific to my machine, or if the MIAB config even touches this, however my box does not resolve IPV6 addresses, and therefore is not favouring them for sending emails if available.
I have tried this on Digital Ocean and Linode, both with no luck! Any ideas?
One of my boxes runs with IPv6 but I’ve never spent much time trying to see if it makes use of IPv6 (and if so, properly). Can you post details that would let me try the same actions on my box, to see what happens / what should happen?
I am not that experienced with IPV6, I was just interested as if I ping ipv6.google.com it does not resolve. Not tried this on a non-MIAB box yet, will try and update to see if it is MIAB specific.