UPDATE: When the fillers email account is entered as an address outside our work email domain, both the receipt (to an outside account) and the notification (to an internal account) are sent. When the filler's email account is in the same email domain as the noficiation email account, the receipt is being received, but the notification is not. I don't have access to our email servers to see if it is an issue on our end, but I don't see why it would be, as we are receiving the reciepts (I would think if the server was bouncing it based on origin neither would be received), and we also recieve notifications from all other forms.
Still looking for an answer to this. We cannot use email receipts within our own email domain because notifications stop being sent.
I am also - for no reason my form just stopped sending us email notifications. I added another email and it will send to that address, but not to the original addresses that are already in the system!
This forms system can be helpful, but it is not always operational