dead.letter file for incomplete messages
If you need to interrupt a message you are creating to complete other tasks, the system saves incomplete messages in the dead.letter file in the $HOME directory.
If the dead.letter file does not exist, the file is created. Later you can edit the file to complete your message.
Attention: Do not use the dead.letter file to store messages. The content of this file is overwritten each time an interrupt is issued to save a partial message to the dead.letter file.