Forgotten SPF Records Leave Domains Open to Spoofing, Security Audit Warns

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A security audit of a mid-sized Brazilian manufacturing company revealed that its SPF record still authorized IP ranges from an email provider decommissioned years earlier, long after migrating to Microsoft 365. Because SPF records function as authorization lists, any infrastructure no longer under a company's control but still listed can be exploited to send mail that passes authentication as the legitimate domain. The audit also highlighted a technical risk: SPF evaluation allows a maximum of 10 DNS lookups, and legacy entries silently consume that budget, potentially causing authentication failures when new services are added. The core challenge identified was that outdated SPF entries rarely trigger alerts or visible failures, making them easy to overlook until they are actively abused. The auditor concluded that cleaning up SPF records requires mapping actual mail traffic rather than relying on outdated documentation, and that SPF hygiene alone is insufficient without also addressing the visible From header through complementary protocols.

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