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I took a look at the email logs and it seems that your SMTP setup is no longer working properly. My suggestion is to look at the settings and check if the same should be applied or if it should be updated.
If the SMTP setup seems OK, then something on your side (you can check the logs on your side to see what) is blocking the emails to be sent from your form.
I see that you have recently set the email to be sent over verified sender option, so if you are still not receiving the same, my suggestion would be to use the firstname.lastname@example.org instead.
You can see more about this here: How to setup email alerts to prevent email bouncing related issues
You can see more about the SMTP setup here: How to Setup SMTP for a Form
Do let us know how it goes.