Unitpost sends transactional email, marketing campaigns and SMS for software teams. You can connect through the REST API, one of nine SDKs, plain SMTP, or the hosted MCP server at mcp.unitpost.com/mcp.

MCP clients such as Cursor and Claude Code sign in with OAuth and get the same actions as the dashboard. Webhooks report delivery events, and inbound email reaches your app the same way. Contacts are unlimited and you pay for what you send. The free plan covers 5,000 emails a month.