The XMPP Extensions Editor has received a proposal for a new XEP.
Title: MUC Slow Mode
Abstract:
This specification describes a way to rate limit messages a single
user can send to a MUC room. It includes room configuration option,
and how servers and clients can handle such a feature.
URL:
https://xmpp.org/extensions/inbox/xep-slow-mode.html
The Council will decide in the next two weeks whether to accept this
proposal as an official XEP.