Saving a draft email
Until you click send, your email will be saved in your Drafts folder so that you can keep a copy of it and come back to it at a later date when you are ready to send
Click the three dots at the top of the email and select Save
Accessing draft emails
Click on the Drafts folder on the left side of the screen
Select the draft email and you can continue editing and send the email as usual
Deleting a draft email
Click on the Drafts folder on the left side of the screen
Click the red cross to the right of the recipient name in the list of draft emails on the left side of the screen, or click Discard at the top right of the screen