ftp and telnet are disabled for security reasons. Secure versions of these programs are available.
telnet has been replaced by Secure Shell (ssh). Secure Shell uses the same syntax as the older Remote Shell (rsh) program.
To connect to the Institute where you have an account ias_username, use:
ssh -l ias_username ssh.math.ias.edu ssh email@example.com
Note: ssh.math.ias.edu is the only host you may connect to from off campus.
If you only wish to check your email, you may do so by using Horde.
Horde is a web-based mail client which can be accessed at https://mail.math.ias.edu