The Silence Command may be used to effectively prevent private messages, commonly known as "PM" from reaching another user.
If you desire to invoke the silence command, type the following in the input line of the Mibbit client:
Replace "nickname" above with the nickname you wish to silence.
To remove silence protection you have set, type the following:
The /silence command blocks both PM messages and notice messages.
After logging out of the Mibbit client, any active nicknames that are silenced will become unsilenced upon restarting the Mibbit Client.