Postfix, by default only listen on ipv4 interface.
this is howto make Postfix listen on both ipv4/ipv6
This example using IPv6 address given by he.net
In main.cf
-- others config -- -- snippet -- inet_protocols = ipv4, ipv6 inet_interfaces = 127.0.0.1, 192.168.200.18, [::1], [2001:470:19:xxxx::2] mynetworks = [2001:470:19:xxxx::/64], [::1/128], 127.0.0.1, 192.168.200.0/24 -- others config -- -- end of snippet --
easy isn’t it? 🙂 IPv6 is enabled out of the box in postfix, all you have to is little configuration tweak.
Have a nice try 😉