Intermediate - As a User signing up, I want to receive an email confirmation upon registration. Use something like SendGrid - (100 free emails per day)
Advanced - As an Admin, I want to receive a daily email report with data about my entities (inventory value, daily throughput, etc). I expect the report to come in at the same time every day. You could achieve this by creating an interval-based Cron Job, running on a serverless host like Google Cloud or AWS Lambda.