The subject is:

Disk usage for localhost 10.2.0.22

The body is:

Fri Nov 16 13:04:33 2001

localhost

10.2.0.22

/ has 66% free
/boot has 65% free
/var has 91% free
/home has 92% free
/usr has 82% free
[download]

Obviously it works better if you have a meaningful hostname.