The GAG mode is applied by a sysop or sysop manager on a user and may not be removed except by a sysop or sysop manager. The user may not be notified when this mode is applied because the mode can be a more effective tool for keeping order if the user doesn't know exactly when it is applied.

The server will discard all messages from a user with GAG mode to any other user or to any channel.

MODE <nick> { + | - }z