If you have an account on the math server you can:

Make a secure shell connection over the web using MindTerm
or
SquirrelMail based interface to access your math mail (Obsolete)
or
Use a SSH client to connect to math.cudenver.edu.
Download and install the windows SSH client from http://ftp.ssh.com/pub/ssh/SSHSecureShellClient-3.2.9.exe
See http://ssh.com for details.