Hi, after reading a lot on the community forums, and having issues myself with the email system, I was thinking an extension or inbuilt feature that sends a "test" email to the store owner at your desired interval, ie 1, 2 or 3 days. So it sends an email every day, or two. Just so the store owner knows the email functionality is still working, google hasn't blocked it or the server you are on hasn't blocked it.

Kind Regards,
Joel

It has either been added since than or was always there. I have it on my clients site.
I believe i just disabled "Allow customer to order this product" , after disabling orders on that product, it has a button that says call to order. Taking you to a phone number