MailChecker is a cross-platform library for determining whether an email address is from a disposable or temporary email provider. It is implemented in 10+ languages (Node.js, PHP, Python, Ruby, Rust, Go, Java, Elixir, Clojure, etc.) via a centralized template-based code generation system. The library's core is a curated blacklist of over 55,000 disposable email domains stored in a plain text file (`list.txt`). Each platform provides a tiny API: `isValid(email)` returns `true` if the email format is valid AND its domain is not in the blacklist, and `blacklist()` to retrieve the domain list. The code generation pipeline (`lib/generator.js`) uses Mustache templates (`*.tmpl.*`) to produce optimized platform-specific code. The repository also includes domain cleanup scripts and comprehensive per-platform tests run in Docker containers. This is a purely application-oriented library; it does not contain data pipelines, ML models, or research artifacts.
Reacher is an open-source email verification system written in Rust. It checks if an email address exists without sending any email by performing syntax validation, MX record lookup, SMTP connection with intelligent response parsing, and miscellaneous checks (disposable, role-based, gravatar, haveibeenpwned). The system is structured as a Rust workspace with four crates: a core library (`check-if-email-exists`), a CLI binary, an HTTP backend server (`reacher_backend`), and an AWS SQS Lambda worker. The backend provides REST API endpoints for single and bulk email verification, supports queue-based scaling via RabbitMQ, and stores results in PostgreSQL. It features a flexible verification method configuration allowing per-provider overrides (Gmail, Hotmail, Yahoo, etc.) with SMTP, headless browser, or API methods, and supports SOCKS5 proxies with routing rules. The codebase demonstrates strong Rust craftsmanship with clean abstractions, builder patterns, comprehensive error handling, and thorough testing.
FlowPilot is a Chrome extension that automates the registration, verification, and delivery of accounts for AI platforms like OpenAI/ChatGPT, Grok (xAI), and Kiro (AWS). It handles email verification codes from a wide range of providers (Hotmail, iCloud, 2925, Gmail, etc.) and SMS verification through multiple services (5sim, HeroSMS, MaDao). The extension features a step-based workflow engine that composes registration flows dynamically based on signup method, payment mode, and delivery target. It includes an auto-run controller for batch account creation, account delivery to external APIs (CPA, SUB2API, etc.), and a contribution system for sharing accounts. Architecturally, it follows the standard Chrome extension pattern with background scripts, content scripts, and a sidepanel UI. The codebase is modular, using factory functions with dependency injection for testability. It has an extensive test suite with over 200 test files, though tests rely on a fragile function extraction method. The project is actively maintained with frequent commits and a versioned release cycle. The codebase demonstrates good engineering practices including a registry pattern for steps and mail rules, i18n support for Chinese and English, and reusable UI components. However, there are some maintenance concerns such as duplicate files, hardcoded external URLs, and dormant code paths for payment features.
This Python application automates the registration of new Cursor IDE accounts, including browser-based sign-up, email verification code retrieval (via tempmail.plus or IMAP/POP3), and updates of Cursor's local authentication tokens and machine identifiers. It serves as a workaround for Cursor's trial limitations by continuously generating fresh accounts. The architecture is a monolithic script with modular components: a browser manager (DrissionPage), email handler, configuration loader, authentication database updater, and machine ID resetter. The entry point is `cursor_pro_keep_alive.py`, which offers two modes: reset machine code only or full registration flow. The code is functional but not highly polished; it relies on third-party email services and browser automation that may break with Cursor or service changes. The project is explicitly deprecated by the author, who recommends alternative tools like Claude Code.