[thought] Surfing the Internet using SMTP. (Why just http?)

I just thought about this idea. Most of the companies have a firewall, that
can stop all http traffic, thus effectively disallowing its employess from
surfing the web . However suppose if we have a proxy agent (some server)
that listens to incoming mails through SMTP. This server will be a filter
that scans all the mails that come to a particular address. Now if an
employee wants to surf the web, he just has to send an email to this server,
with some (pre-defined) magic number in the subject line to tell the server
that it is supposed to send back a reply. The email can contain a list of
URL's that the emplyoee wants to surf. The server can download these URL(s)
using some tool like *wget*, place all the html pages in a reply and send it
back to the employee. Many restrictions like Mail size, or content can be
handled by the server for the particular employee.
Another advancement to this idea can be an SMTP browser, that sends http
queries using SMTP. Countless such enhancements can be made.

SMTP might just be the delivery protocol for http requests.. If the company
allows other protocols, they can be used likewise..

Have to check if such browsers already exists.

Shashank