Fix send error mail parked in draft folder
Fix a problem, Pro mail indicates mail I sent using Microsoft Office 365 Outlook is parked in the DRAFT folder of Yahoo Mail Pro, even though my Office Outlook mail was received by recipient and my Office 365 indicates the mail was sent and opened by the recipient.
Please try clearing cookies, cache, history, and footprints. To do so, please go to https://help.yahoo.com/kb/new-mail-for-desktop/sln27197.html
Also, please make sure to update your browser and if the problem still persists try to access Yahoo Mail in another browser.