If you are unable to empty your deleted items folder:
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Open your Deleted Items folder and select Empty folder.
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Select Recover items deleted from this folder at the top of the page and select Empty folder again.
Tips:
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If you've deleted a lot of email, it may take some time for those items to move to or be deleted from the Deleted Items folder. Leave the browser window open while the deleting takes place.
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If the email still fails to delete properly, select a smaller batch to delete.