To reply to a message that you have selected at the Folder Index screen or that you are viewing, press R (Reply).
You are asked whether you want to include the original message in your reply. Also, if the original message was sent to more than one person, you are asked if you want to reply to all recipients.
It is always a good idea to check the list of addresses in the
Cc: fields before you send a message to
see who will receive it.