About
Resend provides an email API and SMTP service for application developers, with transactional and marketing email functions. It supplies developer libraries, delivery events and integration with React Email. It is relevant to teams building email sending into applications rather than selecting a conventional campaign-only interface.
SMTP sending uses a verified domain and API key, while delivery events can be connected to application workflows. Inbound email can be received on a supplied address or a configured customer domain and retrieved through APIs and webhooks. A provider-maintained MCP server is also documented for connecting compatible tools. Resend is operated by Plus Five Five, Inc.
