Email is one of those things that's genuinely hard to test. It goes out through an SMTP server, lands in a real inbox, and you have no programmatic way to check what arrived. So most teams either test it manually or just assert that sendEmail() was called and call it done.
Neither tells you if the subject line was right, the link was valid, or the HTML rendered correctly.
That's why I built email support into Mokapi. Your backend connects to Mokapi's SMTP server exactly as it would a real mail server. Mokapi captures the message. Your test fetches it over HTTP and asserts on the content. No real emails, no inbox polling, no external dependencies.
The Config
Unlike Kafka or HTTP, email doesn't have a standard specification format. So Mokapi uses a simple YAML config. This is all you need:
