MailSlurp guide agent setup

Title: SPF Flattening: When To Use It, Risks, and Safer Rollout Steps
Description: Understand SPF flattening, why teams use it to manage the 10-lookup limit, and how to avoid stale records and deliverability regressions.
Canonical URL: https://www.mailslurp.com/guides/spf-flattening/
Markdown URL: https://www.mailslurp.com/guides/spf-flattening.md

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