Slightly OT - MX RR Santity Check requested...

[Mark Andrews]

> Assume that we block the pref 5 MX host (which we do).  Shouldn't sending 
> hosts use the pref 10 MX RR?

	Most do but they are not *required* to.

	The RFC have parts which are optional to implement.
	Fallback is one such optional part.

	Mark
 
> ... Kev
-- 
Mark Andrews, ISC
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