A: Haha David seriously thought you were joking when you said does that mean a-z lol. When we say a/b testing it means you can set up different variations and try different things like subject lines and different messaging between two groups of people/segments. Here’s a good overview: https://intercom.help/mailead/en/articles/10095540-how-to-use-a-b-testing-in-mailead-io-to-optimize-your-cold-email-campaigns