Hi Luke! Great question! The Marketo Email Campaign filter gives you the choice of targeting Marketo Programs (Program Name) or Smart Campaigns (Campaign Name). This feature does not target members of a particular campaign or program just because they are a member. Instead, it targets leads who visit your website as a direct result of click a link in the email(s) that were sent by the program or smart campaign specified in the filter. I hope that helps! Let me know if you have any more questions about RTP or segments!