MCR Mail cannot be deleted, but it can be archived once you don't need it in your main inbox any longer.
To Archive a message from the Mobile App:
- From your inbox and swipe left on the message you wish to archive
- The red "Archive" button will appear
- Press the "Archive" button and the message will be moved to your Archive folder
To view archived messaged, you will need to log in to your MCR account from a desktop browser.