Binary package “gajim-antispam” in ubuntu oracular
Gajim plugin to block some incoming messages
With this plugin, Gajim users can block:
* Incoming PubSub messages
* Incoming Messages from Contacts not in your Roster
* You can set a question that has to be answered from contacts
not in your roster, before they can pass the spam filter
Note, that the plugin might interact badly with some IRC gateways.