Email for AI agents. Rust CLI on Resend with a local SQLite mailbox. Works in Claude Code, Cursor, Codex, Warp, Gemini CLI.

Reply from your custom domain email while keeping the original thread and conversation history, designed for Cloudflare Email Routing and Resend.

A Postfix milter that appends the current message's Message-ID value to the References header for outgoing messages - fixing email threading that's broken by mail relays that rewrite the Message-ID header (such as AWS SES).