A product description on thinkgeek.
from thinkgeek"E-mail has been around since before computers.
At first, e-mails were written on rocks and thrown at neighbors.
CC-ing a rock e-mail could be dangerous for an entire village.
Then, e-mails were written on paper and put in weird paper things called envelopes and the postal system delivered them.
This was slow.
Finally, e-mail as we know it came around."