Hi @dotcircle
I would add some hot JS action onto the link. When the user clicks that link, you could use wp AJAX api (https://codex.wordpress.org/Plugin_API/Action_Reference/wp_ajax_(action)) to fire off an email to your client.
This isn’t really an ACF specific question – so if you have any further questions, I would try asking it on a WordPress forum. You may get better/faster help!
Phil
