RAKILL

Usage: RAKILL <user@host>
Removes a specific global kline from the entire network. As with the AKILL command, any server that is split when you issue this command will not remove the entry.
Examples:
/rakill alumnus@nc-67-77-218-198.dyn.sprint-hsd.net
/rakill *@*.digex.net
If you set the global akill and now think it should be removed, you generally should remove it from the entire network. It's not a good idea to leave akills on other servers, because then they may not be noticed for a while and an akill may stay around simply because no one was responsible for removing it.