How to check RBLs work or not ?

Are you using Custombuild 2.0? If yes, you can enable RBL's from within the DA admin panel under Administrator settings.
Also try to use Spamblocker 4.x which is a customized exim.conf and has several good RBL's included.
If you are still using the old 2.0 exim.conf (see top of the file) you have to make some changes yourself.
 
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