I don't think you will be able to fully get away from spam filtering. You will always have to deal with companies such as Verizon who feel they must block things before it would even reach your host.
But as far as I know... most hosts that offer "spam filtering" or "mail blocking" allow you to block only those emails you want to block (or in the case with cPanel... allow you to set the default address to allow all or none for unrouted emails)... otherwise... it all gets thru.
CPanel allows you to enable the spam filter if you want it, otherwise leave it disabled.
Some other mail clients may come with it switched on automatically, in this case, you should be able to switch it off.
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