If you want to delete all emails in Yahoo mail but you have not delete all emails properly.Let's see this presentation and delete all emails. Read more@ http://www.contactsupportdesk.com/yahoo-customer-support/

1. How to Delete All Messages in Yahoo
Account

2. • You can delete the emails both from the
desktop and the mobile. You need to follow
two different procedures for that. Here we will
discuss both the methods.
2. From Web1. From Mobile

3. 1. From Mobile
• Open the Yahoo Mail App from your mobile. If you are
not logged in, then sign in with your credentials.

4. • Now click on the three hyphen button located at the
upper-left corner of the page.

5. • Now click Settings which is the gear icon.

6. • Now scroll down on the menu and slide the Show
Checkbox tab to on. This part has the Message List
section of the menu.

7. • You have to click on the Back icon of your phone
(an arrow for android and a cross for iOS)

8. • Click Inbox.

9. • Click on the check box next to the message.

10. • Click the checkbox located in the purple bar of
the screen.

11. • Now go to the lower-left corner of the page and click
on the trash icon.
• You need to select OK when prompted for
confirmation.

12. • Now click again the three hyphen sign in the
upper-left corner.

13. • Now select the Trash icon after scrolling down.

14. • Click OK to delete all your Yahoo messages.

15. 2. From Web
• Open the Yahoo Mail from the web browser and
log in with your username and password.

16. • Now click the down arrow above your emails.

17. • Now select All from the drop down menu.

18. • Now go to the trash can icon located above the
emails for Delete command.

19. • Click OK to delete all the massages of the page.
• Now you have to repeat the process until your mail box
will be empty.

20. Contact US : 1-888-341-4774
• For more information,
dial a Yahoo Customer Support Service Number.
• Check this article : Yahoo Customer Support