Where do you see them being blocked?
In the security list, or in downloads?

At the moment system rules are enabled and I don't know how to disable them from the GUI.

It would be possible to add an option for deactivating them, but that would decrease the efficiency of Phex, since it also uses these block-lists when forwarding messages and for alt-locs, etc. - means: It doesn't bother processing anything which has any connection to these blocked hosts. I don't know if your software will go as deep.

Does it block incoming packets which don't originate directly from the blocked range but only have an IP from the blocked range somewhere in the header?

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