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You might be asking: “So, should I just send emails to my Gmail address as a test?” Using Gmail as your development email can hurt deliverability You’re thus more likely to preempt unexpected issues in production. By contrast, when you test email with a fake SMTP server, you’re following the same code paths as the ones used for sending production emails. Using a dedicated SMTP server for testing is usually more reliable for testing emails compared to mocking email-sending libraries and classes: When mocking or stubbing out libraries, it’s possible to make errors in the mocks themselves that would allow bugs to slip in. Using an SMTP server, even if it’s a fake one, can be helpful for testing your email functionality. Why should I set up a fake SMTP server for email testing? Manually testing email functionality can quickly become tedious, so we strongly recommend implementing comprehensive automated tests for the emails that your application sends. But while it might be easy to implement unit tests to check the self-contained functions in your code, testing email functionality can be much more complex: you need to not only check for issues within the body of the email that you’re sending, but also within the code paths that do the sending of each email. To mitigate potential email-related issues, some developers simply write more unit tests.

Testing email communications is especially important now that we rely on email for authentication, password resets, two-factor authentication setup, and other sensitive functionality. …and there are many more potential failure scenarios.

emails not getting sent at all due to SMTP connection errors.incorrectly formatted recipient name in the email salutation, or the email address inserted in place of the first name.password reset emails with links that don’t work.In case you’re wondering why you should test the emails you plan to send, here are just a few examples of scenarios that email testing can avoid: Fake SMTP servers are commonly set up for development and testing purposes: as a developer working on an application that sends email, you generally want to double-check all communications that go from your app to your prospects or customers, including any transactional emails, without sending emails to real customers. What is a fake SMTP server?Ī fake SMTP server is a server that accepts Simple Mail Transfer Protocol (SMTP) messages but doesn’t send actual emails to outside destinations. In this article, we’ll walk you through what a fake SMTP server is (with context on why to test emails at all) and show you how to set one up, either as a self-hosted option or using Mailosaur’s managed service.