You can resend the email to all listeners who haven't subscribed yet to remind them about your feed.
Send to a Individual Listener
To send to a single listener, find them in your feed, and click "Edit Listener". Then "Resend Email".
Send to Several Listeners at Once
To send to multiple listeners, select them in your feed with the checkboxes, and click on the envelope icon to resend the invitation email
To resend the email to all listeners who haven't subscribed yet, filter them by selecting Status = "Invited". Then select all the listeners with the checkbox and click on the envelope icon to resend the invitation email.