If you'd like to track how many contacts are opening and clicking links in your emails, you can enable open and link tracking.
New accounts by default have link tracking turned off so you'll need to go your settings to enable it.
Note: Activating it will not affect previous emails sent but will be tracked for emails going forward.
Warning: We do not recommend turning link tracking on as it may cause a decrease in opens & deliverability. We highly recommend branded domains if you plan on enabling this feature.