Sending E-mail via IPv6 won't work

[ruben-herold]

hi,

seems that your mail code tries IPv4 before IPv6 which breaks setups. If I add the hostname to the field (Hostname has IPv4 and IPv6) and the container runs on IPv6 only host it tried to reach the mail server only via IPv4 not even fallback to IPv6.

If I add the IPv6 address it works.