Cardmail Deleted Message Recovery
U of L does not perform any backups of Cardmail email accounts.
The deleted items may still be in the Recover Deleted Items. Use the instructions located at the provided link.
https://support.office.com/en-us/article/Recover-deleted-items-or-email-in-Outlook-Web-App-c3d8fc15-eeef-4f1c-81df-e27964b7edd4