Eero Hermlin on "[Plugin: Dreamgrow Scroll Triggered Box] Not receiving the submitted email address"

Hello,
I am receiving emails that say what I have cut and pasted below. With the email address field being empty. This has happened a few times now. Can I retrieve the submitted email anywhere? How can I fix this problem?
Thank you.
MJ

Submitted values:
box: dgd_scrollbox-6477
page: http://maryannjohnstone.com/testimonials/
user_screen_size: 320px * 508px
email:
undefined: Yes!
===============================
Submitted from IP: 176.83.28.141
Used browser: Mozilla/5.0 (Linux; Android 4.4.4; GT-I9060I Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.91 Mobile Safari/537.36

https://wordpress.org/plugins/dreamgrow-scroll-triggered-box/

Hi

Seems that in your site email field is missing "required" parameter, so users are able to push "Yes!" wihtout entering anything. To fix that, please open scrollbox editor in "Text" mode and ensure that e-mail field shows as following:
´
<input id="email" name="email" required="required" type="email" value="" />
´

I hope this helps.