> If a user setup this rule it's because he doesn't want spam. And if server
> don't block result|error, user can be spammed of iq result for ex

According to xep-0016:
"
The allowable child elements are:
<message/> -- blocks incoming message stanzas
<iq/> -- blocks incoming IQ stanzas
<presence-in/> -- blocks incoming presence notifications
<presence-out/> -- blocks outgoing presence notifications"

So, privacy lists is only about incoming IQ, and assumes that the
client will not send outgoing IQs to contacts it's blocking (which
assumes the client knows the semantics about privacy lists).

cheers,
Remko

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