Be aware that by default, system messages may be emailed to the root user on the local system and that a third-party MUA(((MUA))) may not be installed. Be able to both read and send mail using the built-in mail(1) command. Know the location of user mailbox(((mailbox))) files.

Should this read:

Be aware that by default, system messages may be emailed to the root user on the local system and that a third-party MUA(((MUA))) may be installed. Be able to both read and send mail using the built-in mail(1) command. Know the location of user mailbox(((mailbox))) files.

Why is the lack of a third party user agent a big deal?

I think this refers to not installed "by default" --reed

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Some notes from Jacob K.:

read mail:

mail (for the current user)

mail -u username (for reading another user's mail)

sending mail:

mail -s "test email" root@localhost (hit enter)

type in mail words here (hit return)

. (enter a period, hit return)

EOT (signifies the end of the mail and it is sent to the recipient) OR

""mail root@localhost (hit enter) ""Subject: (fill in subject here, hit enter) ""Type words here (hit enter) "". (enter period)