Booking Confirmation & Invoices Not Sending

I sent out a booking confirmation and invoice yesterday to my client and they said they haven’t received it in their email. I’ve tried sending it 2 more times and still haven’t gotten it. I created a test profile to see if it was an email issue on their end or if it was scritches, and it seems to be an issue with scritches as I didn’t get anything in my email either when I tried sending an invoice to myself. Not sure if anyone else is having this issue?