Sendkit is an email platform for developers, marketers, product teams, and AI agents, bringing transactional messaging and marketing tools together in one service. Businesses can send password resets, receipts, onboarding messages, newsletters, and promotional campaigns through a REST API or SMTP relay. Official SDKs cover Laravel, Node.js, Python, PHP, Ruby, Go, Java, .NET, Rust, and Elixir, with SMTP available for other environments.

The platform also provides a visual campaign editor, audience segmentation, contact management, scheduled delivery, and automations for drip sequences and event-triggered emails. Real-time webhooks and analytics track delivery, opens, clicks, bounces, complaints, and unsubscribes. Email validation and suppression management support cleaner lists, while deliverability features include authentication setup and blacklist monitoring.

Sendkit offers an MCP server that lets compatible AI agents manage email tasks, contacts, campaigns, and metrics through natural-language requests. The company reports more than 10 million messages delivered monthly and 99.98% API uptime over the past 12 months. Its free tier includes 3,000 transactional emails per month and one sending domain, with no credit card required.