Hi @Jezerama, thanks for your post.
If the form submission notification is sent but the mail notification cannot be delivered, the forms submission will still show on the forms tab.
If there is any trouble with the form notification delivery to the mail address, then the email may be added to a blacklist which prevents further notifications.
If the mail notice is unsubscribed from the mail notification itself, then notification is not delivered and the email added to the blacklist.
Generally speaking, mails that begin with “info”, “sales” or some other non-personal name, i.e. a resource email box in the email address have a much higher chance of mail delivery failures, when that happens the email is added to the blacklist.
I have removed the email setup in the notifications for the site link you shared from our Blacklist, you can try to submit a new form submission and then check to see if you receive that. I
If you do not, you should try another mail address or use the built-in Zapier integration to submit the notifications.
Here is how to use Zapier with forms: https://university.webflow.com/article/how-to-integrate-webflow-with-zapier
Here is how to forward a mail notification using Zapier: https://zapier.com/apps/email/integrations/webflow/7041/send-emails-for-new-webflow-form-submissions
Here is how to forward notifications via gmail and Zapier: https://zapier.com/apps/gmail/integrations/webflow/7039/send-emails-through-gmail-for-new-webflow-form-submissions
Due to the nature of email transmission and the possibility that email notifications may not get received due to many external factors outside of Webflow, we cannot guarantee that a form submission notification that is sent will be received to the target mail address.
I hope this helps