MailSlurp guide agent setup Title: DMARC Reject: What Happens, Why Legitimate Mail Gets Blocked, and How To Roll It Out Safely Description: Learn what DMARC reject means, how receivers handle failing mail under reject policy, and how to avoid blocking legitimate messages during enforcement. Canonical URL: https://www.mailslurp.com/guides/dmarc-reject/ Markdown URL: https://www.mailslurp.com/guides/dmarc-reject.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.