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Could you please share with us the link of your form, or the url of the page where your form is, in order to give you further assistance?
Thank you for your reply.
I have checked your form, and I found the Sender Email is not setup to firstname.lastname@example.org, as it has to be. This might be the Cause of the issue.
To prevent this kind of issues I will recommend you to check the next guide, which has important instructions: How to setup email alerts to prevent email bouncing related issues.
So please, do the changes and let us know how it works or if you need further assistance.