The server does not resolve over IPV6 as far as I can tell. Can someone confirm this and/or is it possible to access over IPV6 only?

Hi @misterfinster. Either my ISP doesn’t support it or I didn’t configure IPv6 support for the server. (It’s the same server as my personal Mail-in-a-Box and being IPv4-only has some advantages on Mail-in-a-Box because fail2ban doesn’t support IPv6.)