MailSlurp guide agent setup

Title: Testing user sign-up (for integration and QA testers)
Description: Use MailSlurp's Playground to test ideas or integrations with a real user sign-up, verification, and login process.
Canonical URL: https://www.mailslurp.com/guides/user-signup-playground/
Markdown URL: https://www.mailslurp.com/guides/user-signup-playground.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.