MailSlurp guide agent setup

Title: Spam Folder: What It Means for Deliverability and How To Stay Out of It
Description: Understand what the spam folder signals, why legitimate mail lands there, and how to diagnose sender-auth, reputation, and content issues.
Canonical URL: https://www.mailslurp.com/guides/spam-folder/
Markdown URL: https://www.mailslurp.com/guides/spam-folder.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.