An Administrator wants to make a list of all prospects who complete the Contact Us...

The recommended way to create this type of list is to use an automation rule where prospects who complete the form will match the rule once and be added to the list. An automation rule is a rule that runs continuously in the background and matches prospects based on the criteria you set. You can use an automation rule to perform actions on the matched prospects, such as adding them to a list, assigning them to a user, or changing their field values. However, an automation rule can only match a prospect once in its lifetime, even if the prospect meets the criteria again later. This prevents duplicate or conflicting actions from being applied to the same prospect3. Therefore, an automation rule is ideal for creating a list of prospects who complete the Contact Us form but only want them to be added the first time they complete the form. If a prospect is ever removed from the list, they will not be able to get added back to it, because they will not match the automation rule again.