As noted, the mechanism referred to is for presence (status), not chat messages but the Jabber Software Foundation are already trying to address the issues of spam on im before they become an issue for the Jabber/XMPP community. Robot Challenges, SPIM Blocking Control and SPIM Reporting are three such approaches.
Indeed, one of the major players you left out of the list is the one that has already announced preliminary support, Psi. The Google guys have been working with the Psi team behind the scenes for a while already.
Public AnnouncementForum DiscussionHomepage
Disclaimer: I'm not an impartial observer to the project.
Slashdot Mirror
As noted, the mechanism referred to is for presence (status), not chat messages but the Jabber Software Foundation are already trying to address the issues of spam on im before they become an issue for the Jabber/XMPP community. Robot Challenges, SPIM Blocking Control and SPIM Reporting are three such approaches.
Indeed, one of the major players you left out of the list is the one that has already announced preliminary support, Psi. The Google guys have been working with the Psi team behind the scenes for a while already. Public Announcement Forum Discussion Homepage Disclaimer: I'm not an impartial observer to the project.