ITSC Email to Gmail:
Email Address Redirection http://www.ust.hk/itsc/email/service/forward/index.html
Email Address Redirection is to automatically redirect any emails addressed to you to other email addresses you like.
Sending Email as your ITSC account:
Use Gmail's Sending mail from a different address feature
Choose "Use your other email provider's SMTP servers (we recommend this option for professional mail accounts or domains)."