Re: [Asrg] What are the IPs that sends mail for a domain?

Ian Eiloart <> Wed, 17 June 2009 10:45 UTC

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Date: Wed, 17 Jun 2009 11:45:30 +0100
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Subject: Re: [Asrg] What are the IPs that sends mail for a domain?
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--On 17 June 2009 08:51:06 +0000 John Levine <> wrote:

>> If we don't specify some RFC/BCP to specify how SMTP over IPv6 should be
>> negotiated, then no one will follow.
> The IETF is amazingly resistant to making v6 SMTP different from v4 SMTP
> in any way.
> In particular, I suggested that they not have a rule for fallback to
> AAAA in the absence of MX.  The rationale is straightforward: most
> hosts with AAAA (and indeed A) records are not mail servers, people
> need to add new DNS records anyway for v6 so the incremental effort to
> install MX records is quite small, and it'll make mail more reliable
> by making it easier to tell when a domain doesn't receive mail.  They
> all said too late, there are already a handful of v6 mail hosts.
> Sigh.

But, do they have MX records? If yes, there's not a problem. Do you receive 
any email from them? If no, there's not a problem.

If a good chunk of the world implemented the rule that you've suggested 
(perhaps "*" or  "*.gov" domains, or just gmail), then we'd be in a 
good place. It might not be too late for some leadership initiative to 
actually make a difference outside the IETF.

> R's,
> John
> _______________________________________________
> Asrg mailing list

Ian Eiloart
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