The K command is used to kill (delete) old messages from the system.
You can kill only those messages that are to or from your station.
The format of the command is K, a space, and then the number of the
message to delete.
You can also use the command KM to delete all messages TO you that have
been read.
Use the command KT msg# to kill NTS traffic you are going to deliver.
#K* kills msgs with type * (duplicate bid generated, sysop use only).
#KF kills msgs with type F (forwarded, sysop use only).
#K@ bbscall kills msgs with given @BBS (sysop use only).
