Undeliverable Emails - Clear Cache


Emails are being returned undeliverable when the email address is correct.

More Information

  • Outlook stores a listing of most recently used email addresses within a user’s mailbox. Sometimes this list becomes corrupt and should not be used. 
    • It is recommended selecting the user from the address book when emailing or clearing the cache in order to restore functionality. 

Student Office 365 or Faculty/Staff using Outlook Web App: 

  1. Log into your email account 
  2. Click the Options drop-down located at the upper-right of the Outlook window 
  3. Select See All Options … from the menu 
  4. Click Settings located in the left pane 
  5. Click the General button 
  6. Select the Use the blind and low vision experience option box 
  7. Scroll to the bottom of the screen and click Save 
  8. Click Sign Out 
  9. Log into your email again 
  10. Click Mail located at the upper left of the window 
  11. Click Options located at the upper right of the window 
  12. Click Messaging located in the left pane 
  13. Scroll down and click the “Clear Most Recent Recipients list …” link 
  14. Click OK when prompted to confirm. 
  15. Click Accessibility located in the left pane 
  16. Deselect Use the blind and low vision experience option box 
  17. Click the Save icon located just above the Accessibility heading 
  18. Click Sign Out at the upper right of the window

Faculty or Staff using Outlook: 
To remove one entry:

  1. Open Outlook 
  2. Select New Email on the Ribbon 
  3. In the TO: box ,type the email address you wish to clear from the cache until outlook displays it 
  4. Then Press the down arrow key to select the email address and press the Red X to the right of address to delete it 
  5. All Done.  That entry should now be gone from the Outlook Auto-complete. 
  6. Type in the new address completely and it will be saved in your Auto-Complete.

To remove all entries:

  1. Go to the File pull down to Options 
  2. Click on Mail 
  3. Scroll down to the Send Messages section 
  4. Click the Empty Auto-Complete List 
  5. Are you sure, click Yes. 
  6. Now the history in the Outlook Auto-Complete Cache is empty.


Article ID: 43896
Thu 12/7/17 4:40 PM
Wed 7/26/23 6:00 PM