It is important for us to satisfy the demand of customers on time so it requires that we manage the Stock strictly. Out of Stock Notification in Magento 2 extension is extremely effective in alerting product inventory at the level of product which is set as default.
This option can boost your online sales; moreover, it provides valuable information about buyers’ preferences. That is the reason why you can know what type of product or price should be updated, you also easily meet customer’s demand.
Set Backorders to one of the options:
1, No Backorders ( accept backorders when it runs out of stock)
2, Allow Qty Below 0 (accept backorders when the quantity drops less than 0)
3, Allow Qty Below 0 and Notify Customer (accept backorders when the quantity drops less than 0, and alert the customers can still order)
To avoid email to spam box, your store should be installed SMTP.
Enter these criteria:
Maximum Qty Allowed in Shopping Cart
Qty for Item’s Status to Become Out of Stock
Minimum Qty Allowed in Shopping Cart
It comes to the end of tutorial: Magento 2 Out of Stock Notification Settings: No extension installed required.