A robust backend toolkit designed for high-volume academic outreach. It scrapes author contacts from PubMed/NCBI, runs a three-phase validation (Syntax -> DNS MX -> SMTP Handshake) to ensure deliverability, and routes emails via multiple SMTP providers to avoid blacklisting.
// System Flow
1. User Input → Validation Layer (Pydantic)
2. Core Processing → AI Inference (FastAPI)
3. Data Persistence → Database / File System
4. Response → Client UI