I just added the autoban suggested by Annoying Old Guy above. It appears to block the IP's at the server level. This is simple to install. Maybe ...
It says ...
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Overview
MTAutoBan is a plugin for Movable Type. It maintains an Apache webserver configuration file (also known as an “.htaccess” file) that bans IP addresses in the Apache webserver. The set of banned addresses is generated from the junk objects stored in the Movable Type database. Whenever the set of junked objects changes, the Apache configuration file is updated.
The goal of this plugin is to slow down the flood of junk objects by banning the IP source addresses that generate them. This makes it easier to check the junk objects for bad filtering and makes denial of service effects from excessive amount of junk much less likely. By doing the banning at the Apache webserver level instead of in Movable Type itself, the runtime cost of the banning is minimized. With a good set of filters, even large1 groups of systems are rapidly banned with little effect on the weblog.
Because of the large numbers of compromised computers used to generate junk, the maintenance cost of banning the associated IP addresses must be near zero. This plugin achieves that goal. No maintenance is required once installed, and the defaults are good enough that initial configuration is not even necessary.
To make the banning as automatic as possible, the configuration file is updated whenever
An object is marked as “junk”, either explicitly or via junk filtering.
A set of objects is marked as “not junk” explicitly.
Whenever a junked object is deleted.