MailSlurp guide agent setup

Title: Return-Path in Email: What It Is and Why It Matters
Description: Learn what the email Return-Path is, how it differs from From and Reply-To, and why it matters for bounces, SPF, and deliverability.
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Markdown URL: https://www.mailslurp.com/guides/return-path.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.