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Checking on the forms. I do see that the form
Custom Notation has email email@example.com on the recipient Email Adress.
And on Custom Piano Trax the email is set to firstname.lastname@example.org on the recipient Email Adress.
I've gone ahead and left both on email@example.com.
Kindly perform a submission on your form at this time and let us know if the issue persists. Thank you.