There are 2 issues if anyone considers using external and not local RBLs:

1) Speed/connectivity depending on where you are. The total response of all 
RBLs used should be under 10ms if possible
2) FPs. You don’t control what is on anyone’s list so you may be forced to 
whitelist and that makes things more complex.

A well trained local list would be much faster, way more reliable with no 
packet loss, and extremely more accurate with close to 0 FPs. My local RBL gets 
at least 95% hits with 0 FPs and of course it is way faster and reliable for me 
as I control it.

Lefteris
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