I've started a Wiki Page to collect opinions, arguments and possible solutions at
http://wiki.xmpp.org/web/Server_Aided_Communications_Blocking Feel free to contribute your arguments, opinions and solutions. My summary so far is that blocking command does not support some use cases I consider important. Most prominent is the ability to block stanzas from entities they users is not subscribed to. This is required in order to prevent an attacker, to which the user is not subscribed, from draining a mobile users battery by sending stanzas to the users JID. - Florian
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