Testing SMTP over IPv6

[Steve Deering]

Peter,

It would be good to document this advice in an Informational RFC,
either as an individual contribution or as an ngtrans submission
(assuming it's correct, of course :-).

Steve

---------
At 7:55 PM +1100 12/1/99, Peter Tattam wrote:
>As I set it up, I came to the realization that MX will need to be set up
>correctly for mail to be reliable to IPv6 machines.
>
>Here is the MX list for ip6.trumpet.net
>
>ip6.trumpet.net.        43200   MX      10 louie.ip6.trumpet.net.
>ip6.trumpet.net.        43200   MX      15 louie.trumpet.com.au.
>ip6.trumpet.net.        43200   MX      20 jazz-1.trumpet.com.au.
>ip6.trumpet.net.        43200   MX      30 yarrina.connect.com.au.
>ip6.trumpet.net.        43200   MX      40 warrane.connect.com.au.
>
>
>If you are mixing IPv4 & IPv6 servers in the MX list,  it is important that
>the MX list be set in the following manner...
>
>IPv6 only servers		MX    a
>....
>IPv6 + IPv4 servers		MX    b
>....
>IPv4 only servers		MX    c
>
>
>Where a < b < c
>
>If there is a mix of IPv4 & IPv4 MX's, there must be a dual IPv6 + IPv4 server
>either at the start of the list or before all the IPv4 only servers.
>Otherwise mail will queue indefinitely at the IPv4 servers if the IPv6 only
>server is down.
>
>In my example, louie.ip6.trumpet.net and louie.trumpet.com.au are the same
>machine.  The rest are IPv4 only servers.