Re: [ietf-smtp] Should we update an RFC if people refuse to implement p

Dave Crocker writes:

> If the operational industry has voted with its code and clearly prefers A- 
> labels, than the SHOULD is an especially counter-productive choice, since it  
> creates debate about the specification where, really, it has no benefit.  I  
> suspect MAY is the better choice.  It gives permission and even implicit  
> encouragement, but eliminates the standards tension caused by not using U- 
> labels.
The current preference is for A-labels. But after SMTPUTF8 becomes  
customary: at some point it will make sense to interpret SHOULD using its  
original meaning, here.

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