Make sure you have an active data connection before following these steps.

iPhone imap
1. Choose Settings.
2. Choose Mail, Contacts, Calendars.
3. Choose Add Account...
4. Choose Other from the list of account types.

5. Enter your name, ENGR address, and ENGR password. Use "ENGR" or similar as description.
  6. Choose Save.
  7. Ensure that IMAP is selected as the acount type (it should be by default).
8. For both the incoming and outgoing mail servers, set Host Name to mail.engr.oregonstate.edu and enter your ENGR username and password.
  9. Click Save. 

You should now be able to exit Settings, launch the Mail application and read your ENGR email.