I agree that it would be nice to have fine-grained notifications synchronization across clients.
While looking to see if XMPP have such XEP, I found these extensions from Tigase that might be helpful in writing an official XEP:
I think this covers the specific use case of a push server, which unfortunately limits its scope. For MUCs, it is a perfect fit for XEP-0402: PEP Native Bookmarks <extension>, in the spirit of XEP-0469: Bookmark Pinning? eg: <itemid='theplay@conference.shakespeare.lit'><conferencexmlns='urn:xmpp:bookmarks:1'name='The Play's the Thing'autojoin='true'><nick>JC</nick><extensions><notifyxmlns='urn:xmpp:filter-notifications:0'when='always'/></extensions></conference></item> with when= taking 3 possible values "always", "never" and "on-mention". For contacts, a PEP (XEP-0163: Personal Eventing Protocol) node would work. wouldn't it? <publishnode='urn:xmpp:filter-notifications:0'><itemid='that-damn-guy@annoying.server'><notify when='never'/></item></publish> I am not entirely sure about the real life use-case for muting notifications from a contact when you can just block them via other ways, but maybe I'm just not imaginative enough. :) List, any feedback on these ideas? -- Nicolas