If you add a website to your media library, and you've used the Mobirise website builder, you'll find that most of the sites have a place to subscribe. Of course this is all fictional, but you can connect that form to a Conducttr project and hence send a real-world response such as an email reply.

Please note that adding the code below will cause the player's email to sent outside of TeamXp and directly to a Conducttr project. 

Add Link to JS script just before </body> tag:
<script src="https://teamxp.cm.cr/assets/js/widget_to_conducttr.js"></script>
Add onclick to Button:
onclick="send_request_to_conducttr({CONDUCTTR PROJECT ID},{MATCHPHRASE},{FORM ID})"
<span class="input-group-btn"><button type="submit" class="btn btn-primary" onclick="send_request_to_conducttr('12345','ATROPIATODAY','#mbr-form')";>SUBSCRIBE</button></span>