When you spend money online, you expect a receipt to come in your email. When you register for a new web site, you need to verify your sign up in your email. These types of emails are called “transactional email” and sending these types of email at scale is a complex engineering task.

J.R. Jasperson is the chief architect at SendGrid, a transactional email platform. On this episode, we discuss how email works–from the basics to the massive scale that SendGrid operates on. We also talk about email spam and fraud in detail.

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