Plainmail for Claude.ai
dev.plainmail/mail
Email on your own domains: add a domain, write its DNS, create mailboxes, read and send mail.
client:Claude.ai
transport:streamable-http
Install Plainmail in Claude.ai
Settings → Connectors → Add custom connector
https://app.plainmail.dev/api/mcp/mcpClaude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs