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Mail is an enhanced version of standard `/bin/mail' program.
As well as its predecessor, it can be used either in sending mode or
in reading mode. Mail enters sending mode when one or more
email addresses were specified in this command line. In this mode the
program waits until user finishes composing the message, then attempts
to send it to the specified addresses and exits.
See See section Composing mail, for a detailed description of this behavior.
If the command line contained no email addresses, mail switches
to reading mode. In this mode it allows to read and manipulate the
contents of a mailbox. The URL of the mailbox to operate upon is
taken from the argument of `--file' command line option. If it
is not specified, the user's system mailbox is assumed. See section Reading mail for more detail.
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