[Asrg] On assertions

[der Mouse]

> There seems to be considerable interest in making assertions about
> the mail behavior of domains.  The simplest useful assertion is
> probably "we send no mail", but we've seen at least three different
> variations on that, including SPF -all, the MX 0 . proposal, and
> attempts to shoehorn it into SSP/ADSP.

I thought "MX 0 ." asserted not "we send no mail" but rather "we
receive no mail".  (Of course, as far as receivers are concerned,
either one may lead to rejection of mail, but that doesn't make them
the same thing.)

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