In article <22051.1596843872@localhost> you write:
The explicit discussion was that in some non-Internet contexts, the domain
name is not from the DNS.
I don't understand what that has to do with writing specs that
interoperate on the Internet. If a host is sending mail on the
Internet, it looks names up in the DNS.
Most mail servers have a hack that lets you put in routes manually to
locally override the DNS results, but I've never heard anyone say the
details of that should be standardized. Certainly in the MTAs I've
used, the way you do so has varied all over the place.
R's,
John
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