We also host a number of domains that absolutely never generate mail...They have no MX records and aren't configured on any mail
server (example would be .net and .org domains of an active .com we have running full-function). Should these also have something
in their DNS to tell MTA's that no mail bearing these domains in sender address should be accepted?
Those are the best type of domains to set up SPF records for -- you don't have to worry that somehow someone somewhere will send legitimate E-mail that will fail SPF. In this case you can just set up an SPF record of "v=spf1 -all", to say that any E-mail coming from those domains is not legitimate.
-Scott
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