How to turn off Message encryption on Spark ? help me !
Speaking of what encryption do you mean. If you speak about the OTR (Of the record) plugin, then you can just remove that plugin or add it to blocked list in the default.properties (inside the spark.jar). If you are talking about SSL connection, then turn it off on the server.
Disable OTR in Spark clients for all users on Openfire 3.8.2