This module limits the rate of outgoing unsolicited messages from local clients. Optionally, unsolicited messages coming in from remote servers may be limited per s2s conneciton. A message counts as "unsolicited" if the receiving user hasn't added the sending user to their roster.
The module depends on mod_track_muc_joins in order to allow sent messages to joined MUC rooms.
To set a limit on messages from local sessions:
unsolicited_messages_per_minute = 10
To enable limits on unsolicited messages from s2s connections:
unsolicited_s2s_messages_per_minute = 100