How do I test my IPv6 capable mailserver?

Just a quick tip: You have Postfix running and want to enable IPv6 for your email as well? After quite some playing around I finally got it right:

inet_interfaces =,, 2a01:348:6:315::2, ::1
inet_protocols = ipv4, ipv6

This makes Postfix listen only where you actually need it to – I dont like daemons listening on interfaces where they are not serving any requests.

How do I test IPv6 enabled mail?

Just go to here¬†and off you go. Dont forget to put a fancy text in there what you can show off with… *g


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