MailSlurp guide agent setup

Title: SPF Verification Guide: How to Check and Validate SPF Records
Description: Learn how SPF verification works, how to check an SPF record correctly, and how to interpret pass, fail, softfail, and neutral results.
Canonical URL: https://www.mailslurp.com/guides/spf-verification/
Markdown URL: https://www.mailslurp.com/guides/spf-verification.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.