Deletes the indicated messages from your MOO email collection.
By default, your current message is deleted.
See "help message-sequence" for the full list of possible arguments.
You get the message numbers for use here by typing the '@mail' command.
There is no confirmation for this action, so be careful. While it is true that @unrmmail will be able to bring back the messages deleted by the last @rmm, any messages deleted before then are really gone, i.e., irrecoverable. See "help @unrmmail" for more information.
This command may be used on other mail recipients (children of $mail_recipient), but only ones to which you have write access (you either have to own it or be on good terms with whoever does...).
You can try to delete messages that you accidentally sent to a person with the command @unsend (see "help @unsend"). Note there are restrictions on the operation, so it often will not work.