Testing workflows that involve email are often complex and time-consuming. Development teams must build custom email API clients for automation while also setting up temporary inboxes for manual testing scenarios, such as user testing or internal product training before major releases. These challenges become even more pronounced when developing customer onboarding products. We’ve had a positive experience with MailSlurp, a mail server and SMS API service. It provides REST APIs for creating inboxes and phone numbers as well as validating emails and messages directly in code, and its no-code dashboard is also useful for manual testing preparations. Additional features like custom domains, webhooks, auto-reply and forwarding are worth checking out for more complex scenarios.
