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Re: [ipv6-wg] Real-world IPv6 SMTP experience

  • To: Florian Weimer <
    >
  • From: Gert Doering <
    >
  • Date: Wed, 21 Dec 2005 15:50:52 +0100
  • Cc: Gert Doering <
    >,
  • Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
  • Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=testkey; d=space.net; b=EICMmhQoKvJQrFASaMd8SHdBXrr+1RnRMRfUASWD/4MhQ6EhoW3HDPlVxmP92mH3 ;

Hi,

On Wed, Dec 21, 2005 at 03:23:27PM +0100, Florian Weimer wrote:
> Selective quoting. 8-) There are a couple more MX records:
> 
> greenie.muc.de.         900     IN      MX      15000 mx1.muc.de.
> greenie.muc.de.         900     IN      MX      16000 mx-150.space.net.
> greenie.muc.de.         900     IN      MX      16500 mx-200.space.net.

Indeed.

> These are IPv4-only, and they help to pamper over the AAAA-masks-A
> issue.  If a broken Exim installation sees just this record for
> kirk.greenie.muc.de:
> 
> kirk.greenie.muc.de.	9m16s IN AAAA	2001:608:4::3
> 
> it still falls back to the other MXes.

So if I understand this correctly, having a v4-only backup MX should
solve all problems commonly experienced?

Gert Doering
        -- NetMaster
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