[ietf-dkim] New Issue: ssp-04 DNS operational requirement

[Roland Turner]

On Wed, 2008-07-02 at 19:40 -0700, Douglas Otis wrote:

> This section also imposes a new  
> interoperability requirement for SMTP that previously did not exist.   
> Prior to the imposition of this requirement, crucial systems with  
> addresses assigned within a host address entry could sustain  
> communications even in the event of DNS becoming inoperable.
> 
> Perhaps the following sentence could be added:
> ---
> 
> To ensure message reception remains viable for crucial systems when  
> DNS fails, the IP addresses of crucial SMTP clients should be white- 
> listed. This will allow ADSP and DKIM to be selectively bypassed  
> during such events.

Surely the right and ability of administrators to make such arrangements
with respect to the relationships between machines under their control -
and/or that of others with whom they have private arrangements - is
implicit in _all_ RFCs?

That a spec doesn't give me permission to add whitelisting facilities
for communication between crucial hosts doesn't mean that I can't do so,
nor that my doing so creates interoperability problems.

- Roland

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