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This sends an email from a file:

mail -s “here is the subject” email@rigler.org,otheremail@rigler.org < /etc/motd

This sends an email from a pipe:

ls -l | mail -s “here is the subject” email@rigler.org,otheremail@rigler.org

When you first install the system, if you have /etc/resolv.conf configured, email will figure out
where to go.

If you want to forward email sent to your unix account to a different account, just add the email
address that you want to use to a file called ~/.forward