Linux - Specify From Address With Mail Command

I struggled a bit with figuring out how to specify the from email address when sending mail on the Linux command line.  In short, you need to use the -r option.  For example:

echo "Enter your message here.  Thank you." | mail -s "Enter your subject here" -r This email address is being protected from spambots. You need JavaScript enabled to view it. This email address is being protected from spambots. You need JavaScript enabled to view it.