Mailshell Anti-Spam SDK integrates with Mailshell's AI Engine and LiveFeed cloud-based reputation service to provide accurate email fraud, phishing, and spam detection. It utilizes four fraud detection engines and a proprietary SpamScore formula to combine results into a final spam probability score, achieving a near-zero false positive rate. The SDK offers over 120 configuration options for optimization and includes an API for integration with other applications. A lightweight version, SDK Lite, is designed for low-memory devices, requiring less than 1MB of code. The solution is continuously updated by Mailshell's Internet Security Lab and is used by over 500 million end-users worldwide.