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in 18e55a6e91 I noticed that we should be
handling 552 as a transient failure, but I neglected to mention this
change in the changelog because it seemed obscure and "couldn't" hurt
anyone.
I overlooked that we have client response rewriting and of course this
change did impact one of our sponsors that rewrites certain transient
452 responses to 552 responses.
So, let's add a note explaining this to see if we can prevent others
from hitting it in the future.