Tony Finch wrote:
2. Accordingly, the definition of what they do and do not
want MUST be such that the RECIPIENT defines it... not the
IETF, not the sender's ISP, not the recipient's ISP, nor
some governmental body, nor anybody else.
Most users prefer to delegate this job. It's 10x more efficient
to do so.
Not to quibble, but I would have guessed several orders of magnitude greater.
Also, for most of the world's 1+ billion users, I'd have added "effective" to
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