MailSlurp guide agent setup

Title: DMARC Policy Guide: none vs quarantine vs reject
Description: Learn how DMARC policy works, when to use none, quarantine, or reject, and how to roll out enforcement without breaking legitimate mail.
Canonical URL: https://www.mailslurp.com/guides/dmarc-policy/
Markdown URL: https://www.mailslurp.com/guides/dmarc-policy.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.