Postfix supports IPv6 from version 2.2 and up. By default only IPv4 support in enabled. Enabling IPv6 is as easy as adding one parameter to Postfix’s main.cf:
/etc/postfix/main.cf: # You must stop/start Postfix after changing this parameter. inet_protocols = ipv4 (DEFAULT: enable IPv4 only) inet_protocols = all (enable IPv4, and IPv6 if supported) inet_protocols = ipv4, ipv6 (enable both IPv4 and IPv6) inet_protocols = ipv6 (enable IPv6 only)
Be sure to also update match lists as mynetworks and debug_peer_list with relevant IPv6 addressing.
