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Re: [ietf-dkim] Issue 1535 - clarify need for domain existence check in the decision tree (step 2)

2008-03-18 12:09:59

On Mar 18, 2008, at 11:31 AM, Frank Ellermann wrote:

Steve Atkins wrote:

As the hostname being checked is on the RHS of an email address  
there must be an A record or MX record for it, in order for it to  
be... operationally relevant, anyway.

JFTR, if all goes well 2821bis will explicitly add AAAA.  This does  
not mean that "AAAA only" is an operationally good idea today, but  
the "MX required" faction was hopelessly outnumbered for 2821bis.

What justifications were given for including AAAA records as SMTP  
discovery records in the face of today's level of abuse?   
Nevertheless, this outcome does not prevent a requirement for MX  
records when publishing DKIM policy.  Only MX records are required to  
be at the email-address domain and are used specifically by SMTP.   
Having the MX record to qualifyuse of email policy can reduce the  
number of transactions required for policy discovery, and offers a  
practical means to disavow use of DKIM/SMTP.

-Doug
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