Daily or weekly review questions by email

Hi, all, I'm researching ways we can keep employee information fresh by using a daily or weekly refresher interaction by email. The idea is to send one question. If they answer correctly they get a brief reinforcement, and if incorrect a brief remediation. It's for employees in a call center type environment so we don't want them off the phones for long, but we have talked about putting a leaderboard on their team page. We have a Workday LMS but it's new to us. I'm going to talk to our resident expert shortly but wonder if anybody has alternative ideas. Mailchimp is the one I was asked to investigate but it's hard to find any use cases via Google to see how well it works for that.