To read the current message:
<Return>
This will display the current message, as indicated by the > symbol.
To display a message by its number:
5
This will display the contents of message number 5.
To display a range of messages by number:
4-7
This will display messages 4 through 7, starting at message 4. Press <Return> to go to the next message.
To display all the messages from a specific user:
p bob
This displays all the messages in your mailbox from the user bob, starting from the first message received.
Press <Return> to go to the next message in the series.
To redisplay the mail headers:
h
This redisplays the the mail headers, showing you what mail you have in your mailbox.