I'm talking about the temporary blocking of an IP address that has made x number of bad recipient attempts in a given amount of time
That's blocking an IP from sending to your known recipients because the IP sends a lot to unknown recipients. Not a good idea in general, since you will block legit MTAs that are spewing backscatter.
Another approach that works well ime is you adding the guard condition of no PTR:
If no PTR, then If unknown recipient rejects per <period> greater than <x>, then blacklist.
I make the above block a permanent, not temporary, block because of the "double-fault" of no PTR and excessive rejects.
Here's another definition which is probably one of the more widely accepted ones:
http://greylisting.org/
Len
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