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Re: [ietf-dkim] Discussion of Consensus check: Domain Existence Check

2008-06-13 10:42:34

On Jun 13, 2008, at 1:17 AM, Charles Lindsey wrote:

On Wed, 11 Jun 2008 18:06:57 +0100, Douglas Otis <dotis(_at_)mail- 
abuse.org>
wrote:


Which TLDs should be ignored?  Imposing SMTP domain requirements will
likely reveal a need to make many exceptions.  Do you agree there
should be a means for making exceptions?  Whether making address
assignments exclusively within MS Exchange is considered stupid (and
you'll find agreement there), imposing a requirement that email-
addresses must be valid (in some manner) changes SMTP
interoperability.  As it is now, recipients will normally see these
messages (which may not expect a response), and might even be
considered an alternative to the use of "do-not-reply@" local-parts.

You may ignore any TLD not recognized by ICANN (for that purpose, all
national TLDs are deemed so recognized).

The domains being ignored can _not_ be based upon it not having a  
valid TLD.  This would permit bad actors a means to employ look-alike  
spoofing.  Their spoofs might use ACE-labels for example, or things  
like ".C0M".

-Doug

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