Step 1: Download and extract the MFCMAPI tool from http://mfcmapi.codeplex.com.
Step 2: Launch mfcmapi.exe and click OK through the intro screen.
Step 3: On the Session menu, click Logon.
Step 4: Select the Outlook profile for the affected mailbox, and click OK.
Step 5: Double-click the email address and navigate to Top Of Information Store < Sent Items < PR_CONTAINER_CLASS,
Step 6: Update the Binary Value with “4900500046002E004E006F0074006500”
Step 7: Close and reopen the Outlook.