MailSlurp guide agent setup

Title: Email Testing Before You Send: Preflight Checklist For Reliable Campaigns
Description: A practical pre-send testing guide for marketing and product teams covering spam risk, rendering, links, auth, and workflow checks.
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Markdown URL: https://www.mailslurp.com/guides/email-testing-before-you-send.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.