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Displaying information
=
Displays the current message number.
headers [msglist]
h [msglist]
Lists the current pageful of headers.
from [msglist]
f [msglist]
Lists the contents of From headers for a given set of messages.
z [arg]
Presents message headers in pagefuls as described for headers command. When arg is ., it is generally equivalent to headers. When arg is omitted or is +, the next pageful of headers is displayed. If arg is -, the previous pageful of headers is displayed. The latter two forms of z command may also take a numerical argument meaning the number of pages to skip before displaying the headers. For example: 
& z +2

will skip two pages of messages before displaying the header summary.

size [msglist]
si [msglist]
Lists the message number and message size in bytes for each message in msglist.
folders
Displays the value of folder variable.
summary
su
Displays current mailbox summary. E.g.: 
& summary
"/var/spool/mail/gray": 23 messages 22 unread