[I] Make the message Information Only. (Recipients can't reply to it,
but you can.)
[P] Make the message Priority. (Recipients are alerted to it.)
[R] Return receipt requested as each recipient reads the message.
[S] Scramble the text. (You'll be asked for a password and a hint.
Recipients will be shown the hint and must enter the password to
unscramble and read the message.)
[V] Set a date on which the message will Vaporize (be deleted) from
each recipient's Mailbox. (Recipients may override.)
[X] Make the message Closed. (Recipients can't forward it, but you can.)
The following commands are toggles. Enter them once, and you perform the
associated action. Enter them again, and you undo it. If you forget what
state they're in (on or not), enter ? and MailMan will tell you.
[C] Make the message Confidential. (Surrogates can't read it.)
[D] Request a Delivery basket to which the message will be delivered in
each recipient's Mailbox. (Whether the request is honored
depends on each recipient's delivery basket privileges setting.)