unknown problem with mx1.freebsd.org

[Byung-Hee HWANG]

Hi there,

Let me say this.. I just like all stuff around IPv6. And now I need one
native IPv6 address for my FreeBSD box, which is email gateway. There
was unknown problem related to IPv6 area between my FreeBSD box
[2002:9be6:9d5d:1::1] and mx1.freebsd.org [2001:4f8:fff6::34]. 

Here is the shot obtained from my email header: (see 'unknown' string)

--- the shot begins here ---
Received: from izb.knu.ac.kr (unknown [IPv6:2002:9be6:9d5d:1::1]) by
        mx1.freebsd.org (Postfix) with ESMTP id 51F7B13C459 for 
        <test at freebsd.org>;
        Fri, 12 Oct 2007 09:17:41 +0000 (UTC) 
        (envelope-from bh at izb.knu.ac.kr)
--- the shot ends here ---

Sometimes, it brought about time out error on MX routing between my
FreeBSD box and mx1.freebsd.org.  

And now here are two questions for the *radical* solution: 
[1] Is it possible to obtain native IPv6 address? 
[2] If it is possible, how can I obtain the native IPv6 address?

Or I would like to listen to any comments;;

Thanks,

-- 
Byung-Hee HWANG <bh at izb.knu.ac.kr>

"And I ain't gonna change."
		-- Nino Valenti, "Chapter 13", page 184