How can an admin find the number of mailable prospects in their database?

Mailable prospects are prospects who have opted in to receive email communication from you and have not bounced or unsubscribed. You can find the number of mailable prospects in your database by navigating to the prospect list and selecting “Mailable Prospects” from the dropdown menu. You can also filter the list by tags, campaigns, or custom fields to segment your mailable prospects. References: [Mailable Prospects], [Filter Prospects]