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I can see that emails have failed and this is because your email address is in our bounce list, here is the reason of that:
Reason(s) : smtp; 550-5.7.1 Unauthenticated email from ymail.com
I have removed it now and you should receive your emails now and I can confirm that, I submitted your form and noticed the email was successfully sent:
I would suggest you to follow this guide in order to avoid bouncing: How-to-Setup-Email-Alerts-to-Prevent-Email-Bouncing-Related-Issues
You're able to check and remove your email address if this is in our bounce list again, here is the guide to do it: How-to-Remove-Your-Email-Address-from-Bounce-List
If the issue still persists, try using SMTP, if after doing this you are still not receiving emails, please let us know, we will be glad to further check your form.