When someone gets an email in Outlook for example, and the pictures don't automatically show, but the recipient clicks 'Download All Pictures' it registers in Marketo as the person clicking every link. ( I was told this by a Marketo employee.) So I am just trying to determine how to exclude those people from my Smartlist as it leads to extremely inaccurate results when they are included and we are working on targetting a super specific group of people based on their clicking this specific link.