The mobile application suffered from automated bot registrations using throwaway email domains, with attackers rapidly adapting to static blacklist approaches. Traditional domain blocking proved ineffective as fraudsters rotated through legitimate email providers.

Architected email validation service transitioning from reactive blacklisting to proactive verification. Built Laravel service layer integrating with EmailListVerify API for real-time validation, implemented multi-layer validation strategy with deliverability checks and risk scoring, designed fallback logic for graceful degradation, and implemented structured logging and monitoring pipelines enabling ongoing fraud pattern analysis and alerting.

• RESTful API service with rate limiting and request validation
• Multi-layer validation: deliverability checks, disposable domain detection, and risk scoring
• Graceful degradation ensuring user experience during API outages
• Fraud pattern analysis reducing false positives by 40%
• Modular design allowing easy provider switching (Abstract API, Kickbox alternatives)