Can you tell me what error message you get?  Is the problem that the extension in that mail message is .bin instead of the correct .py?

I have attached the file to this message so hopefully it will arrive in your inbox in a useable state.  If it doesn't, try visiting the Scripts page on the Chimera wiki (http://plato.cgl.ucsf.edu/trac/chimera/wiki/Scripts).  The smoothMD.py script is linked there and should be downloadable.

--Eric