If you are in dire need, and require to send and receive emails with a student; and already have an email with google.com (Students can just login with their credentials from glamlife.glam.ac.uk). Then you could use the google mail account to temporarily send and receive emails with the student. The emails should be routed through Google’s mail servers.
Then again, you never know. The system is still critical until the migration is complete.
Good luck to the Webteam and the developers