HubSpot Sales Professional tracks URLs that have been formatted as hyperlinks in your email client (e.g. Gmail, Outlook). Before sending your email, confirm that you've added your link as hyperlinked text; by default, it will typically appear blue and underlined.
If a raw URL that is not clickable is added into an email (e.g. www.hubspot.com), the link will not be tracked.If you would like to test link tracking, you will need to click the link from an email client and browser that do not have HubSpot Sales installed; otherwise, the click notification will be suppressed. This functionality is in place so that you don't receive notifications when you click your own links.