Email Security Foundations #04: SPF mistakes, troubleshooting, and validation
This post is part of the Email Security Foundations series on MSDigest.net. The mistakes that break SPF quietly SPF usually does not fail in loud or obvious ways. Mail does not bounce with a helpful error message. It just gets filtered, delayed, or rejected somewhere else. You only find out when someone eventually asks, “Did you get my email?” These are the mistakes I see most often, and how to fix them. Multiple SPF records …
