What email addresses to use for testing?

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Safe email addresses for testing

When testing email functionality, it’s important to use designated test addresses to avoid unintended consequences like deliverability issues or spam complaints.

Resend provides a set of safe email addresses specifically designed for testing, ensuring that you can simulate different email events without affecting your domain’s reputation.

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Why not use @example.com or @test.com?

Many developers attempt to use domains like @example.com or @test.com for testing purposes. However, these domains are not designed for email traffic and often reject messages, leading to bounces.

A high bounce rate can negatively impact your sender reputation and affect future deliverability. To prevent this, Resend blocks such addresses and returns a 422 Unprocessable Entity error if you attempt to send to them.

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List of addresses to use

To help you safely test email functionality, Resend provides the following test addresses, each designed to simulate a different delivery event:

Using these addresses in your tests allows you to validate email flows without risking real-world deliverability problems. For more help sending test emails, see our testing documentation.

Whether you need to confirm that an email has been sent, track engagement events, or simulate a bounce scenario, these addresses provide a controlled and predictable way to test your email integration with Resend.