mail -f로 열고 나서 수정하려는데요..

help 라고 쳐보시면 사용가능한 명령어가 나옵니다.
다음메세지로 이동은 n이죠?

& help
    Mail   Commands
t <message list>                type messages
n                               goto and type next message
e <message list>                edit messages
f <message list>                give head lines of messages
d <message list>                delete messages
s <message list> file           append messages to file
u <message list>                undelete messages
R <message list>                reply to message senders
r <message list>                reply to message senders and all recipients
pre <message list>              make messages go back to /usr/spool/mail
m <user list>                   mail to specific users
q                               quit, saving unresolved messages in mbox
x                               quit, do not remove system mailbox
h                               print out active message headers
!                               shell escape
cd [directory]                  chdir to directory or home if none given