LenoxSoft is using a repeating Engagement Studio program to send prospects who complete a specific...

By using a static list on the form's completion action that is used as the recipient list on the program, then remove prospects from the static list before every end step in the program.

By using an automation rule to add prospects to a static list based on the form being completed, then use that list as the recipient list on the program.

By creating a dynamic list based on the form being completed and use that list as the distribution list on the program.

By using a static list on the form's completion action, then start the program with a "Form Completed" trigger so only prospects who completed the form will get the follow up actions.