Office 365 email leads Checker v2.0

Features:

• Live Microsoft Authentication Gateway Validation : Connects directly to Microsoft's login credential type endpoint to verify email existence against active Azure AD/Office 365 directories in real-time
• Multi-Threaded Concurrent Processing : Configurable worker pool up to 32 simultaneous threads executing independent validation requests with ThreadPoolExecutor orchestration
• Proxy Rotation Engine with Health Tracking : Smart proxy pool maintaining failure counts per proxy, automatic rotation with degraded proxy removal after configurable threshold, and success-based health recovery
• Four-Stage Retry Protocol : Exponential backoff with configurable delays (0.5s, 1s, 2s) for connection timeouts, HTTP errors, and rate limit responses, retrying up to 3 times before marking as error
• Rate Limit Detection & Adaptive Throttling : Parses HTTP 429 Retry-After headers for Microsoft-imposed rate limits, executing exact server-specified delays with configurable base throttling
• Session Resume Architecture : JSON-based temporary state persistence saving all unprocessed s every batch, enabling complete session recovery after crashes or intentional stops
• Dual Output Results Segmentation : Valid s stream to valid_s.txt in session directory, failed/error s accumulate in retry queue with automatic retry.txt export
• Batch Processing with ETA Calculation : Processes s in configurable batches (default 100) with real-time ETA computed from current processing rate and remaining queue size
• Atomic File Operations : Thread-safe file writes using Lock synchronization preventing concurrent write corruption across worker threads
• Deduplication Engine : In-memory processed emails set with file-lock synchronization preventing any from being validated twice within a session
• GUI Queue Decoupling : Background threads communicate with GUI via thread-safe queue system, processed every 150ms preventing UI freeze during high-throughput operations
• Live Statistical Telemetry : Real-time counters for valid, invalid, and error counts with proxy pool health indicator updating throughout session
• Configurable Runtime Parameters : On-the-fly adjustment of worker count (1-32) and rate limit delay through configuration dialog without restarting
• Session-Isolated Output Directories : Timestamped results folders (results/email_session_YYYYMMDD_HHMMSS) preventing cross-session file conflicts
• HTTP Error Classification : Distinguishes between timeouts, connection errors, and HTTP status codes with truncated exception messages for clean logging
• Proxy Lazy Loading : Proxies loaded on-demand and tested lazily during validation, preventing pre-validation proxy pool exhaustion
• Clean Session Termination : Stop command signals all threads via threading.Event, allowing current requests to complete while preventing new submissions
• International Support : Full emails library integration handling country codes, national formatting, and validity checking across global ing plans
• Structured Logging with Timestamps : Every operation logged with HH:MM:SS timestamps, categorized output (VALID/INVALID/ERROR/RATE limited), and batch completion summaries