Imitate Email is a sandbox email server with a set of tools that help build and test email based functionality.
For developers, the embeddable email viewer can be place inside the software that they're building making it very easy to build email flows.
For QA and users, the login-less authentication makes testing email flows intuitive and part of the product.
For testers, the programmatic access enables automation of email based flows so that key parts of functionality can be regression tested.