On message to channel
This action enables all the "Message > Sent/Blasted > On XXX message to channel" condition triggering so that you may have more fine-grained control over the behavior of the server.
This action takes no parameters, and you cannot disable the triggering after enabling it.
By default, for efficiency, the conditions are disabled from being triggered, so the Fusion event loop doesn't have to pause to handle messages it doesn't need to.
There is a Lacewing Blue Server variant of this action that has more parameters, here.