You need:
* ^Received:.*200\.225\.1(4[4-9]|5[0-9])
Don't forget to anchor this... You don't want to match some poor
sap who's coming from 32.200.225.144 when you really wanted to
block 200.225.144.*
Maybe
* ^Received:.*200\.225\.1(4[4-9]|5[0-9])\.
* ^Received:.*200\.226\.(0|0?[0-9]?[0-9]|1[0-1][0-9]|12[0-7])\.
But this one is good. I assume the first was just a typo... :)
Chris
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