No, that's not correct. Rspamd started the own protocol based on SA protocol long ago. Then there was a workaround to support SA clients. However, long time ago, Rspamd has switched from own protocol to the standard HTTP (using JSON to produce results). Hence, if Exim wants to be compatible with both Rspamd and SA, it should support only SA protocol and HTTP protocol for Rspamd. No need in 3 protocols. >From my side, I think I need to fix legacy modes support in Proxy only. Other components should be fine to my knowledge.
