Martin Barry:
> Hi
>
> I noted that postfix is writing headers with "unknown" instead of the IPv6
> reverse DNS that I know exists.
>
> e.g.
>
> Received: from merboo.mamista.net (unknown [IPv6:2001:470:1f0b:1055::1])
> by tigger.mamista.net (Postfix) with ESMTP id 581F21100B4
> for <sage...@sage-au.org.au>; Mon, 22 Mar 2010 02:18:00 +1100 (EST)
>
>
> $ dig -x 2001:470:1f0b:1055::1 +short
> merboo.mamista.net.
>
>
> I'm still convinced the problem is not with postfix but is there a way to
> imitate it's IPv6 reverse DNS lookups so I can get closer to the cause of
> the problem?
The reverse name must resolve to the client IP address. If they don't
match, Postfix will use the name "unknown", because the client name
is used for logging and may also be used for access decisions.
Wietse
