If you are using Cmail, you can update your contact information by doing the following:

To edit your contacts, first open your Contacts list:

Click Cmail at the top-left corner of your Cmail page, then choose Contacts.

http://blogs.cornell.edu/chemit/files/2013/06/Contacts-Cmail-1iwf7aa.png

Then edit your contact information:

1. Find and select the contact you have created for our old address "crcf@cornell.edu".
2. Highlight the old email address (crcf@cornell.edu) and replace it with ChemIT@cornell.edu.
3. Make any appropriate changes to the contact name.
4. Exit the open contact to save automatically or click Save now in the upper right hand corner.