Draft - not saved
Yahoo - PAY ATTENTION!
Your new email does not save Drafts. Any email placed in Draft the body of the email disappears. Please fix this immediately.
Please try clearing the browser’s cache and cookies. If you still encounter issues, use a different browser (anything but Internet Explorer) You can find a list of supported browsers here: https://help.yahoo.com/kb/SLN4556.html
The problem in the Yahoo email not saving the Drafts is Yahoo's problem not mine! You never tested your system and there is a flaw in it. Now fix it. Do not blame the customer for something you are responsible for.