Hi, John, On 6/22/2017 10:04 PM, John C Klensin wrote: > Joe, > > I think we are in agreement -- we have been so far-- We are. > but let me > add a real world example that might help clarify some of this. Your example makes a good point - my interpretation of that is "don't rely on half of the Postel Principle". > ... there is a long history of reasonable > applications of the principle and an equally long on of > unreasonable applications including situations in which senders > have claimed "be liberal about what you accept" allows them to > send complete nonsense and, if things then don't work, to claim > that is the receiver's fault (see my earlier comments about > common sense). They need to "be conservative in what you send". The principle cuts both ways. Joe