You can Remove duplicate emails by check the "Auto Remove Duplicates" button from the list.
Extract Emails :You can Extract Emails by check the "Auto Extract Emails" button and you get the list of email addresses from the selected files or folder.
Text Option :You can Extract Emails by check the "Text tab" and you get the list of email addresses from the selected option like Plain Text, Text Frame, Header, Footer, EndNotes, FootNotes, Comments and Master Slides.