MailSlurp guide agent setup

Title: Spam Filter Guide: How Email Spam Filters Work and What They Flag
Description: Learn how spam filters evaluate email, which signals trigger filtering, and how teams can test auth, content, and sender reputation before they send.
Canonical URL: https://www.mailslurp.com/guides/spam-filter/
Markdown URL: https://www.mailslurp.com/guides/spam-filter.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.