In short
When you uninstall, the server's mail works again as it did before Clisec was installed.
From app.clisec.cl
Under Servers, remove the server. Clisec uninstalls itself within a few minutes.
From the server
clisec-agent --uninstallSuspend protection
To stop filtering mail without uninstalling:
clisec-agent --disableTo resume it: clisec-agent --enable.