MailSlurp guide agent setup

Title: How to preview an email in Gmail
Description: Preview the same delivered email in Gmail web, web dark mode, Android light and dark mode, and Gmail on iPhone before sending.
Canonical URL: https://www.mailslurp.com/guides/how-to-preview-an-email-in-gmail/
Markdown URL: https://www.mailslurp.com/guides/how-to-preview-an-email-in-gmail.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.