Sendmux
AI-optimized email API and routing platform for autonomous agents.
Quick Keypoints
- Strips signatures, quoted history, and code to clean JSON data for LLMs.
- Supports bring-your-own-provider settings for SES, Gmail, and SMTP.
- Implements granular API quota limits to protect LLM token budgets.
- Exposes signed webhooks and Server-Sent Events (SSE) for real-time routing.
What is Sendmux?
AI-optimized email API and routing platform for autonomous agents.
Sendmux is a unified email API built specifically for AI agents and developer workflows. It acts as an email inbox wrapper, automatically cleaning signatures, styling, and historical replies so that AI models only process raw JSON text, optimizing token efficiency and reducing parsing logic.
Who Needs Sendmux?
AI software engineers, chatbot builders, and developers building email integrations.
Primary Use Cases
- Cleaning inbound emails into token-efficient JSON for AI agents.
- Routing outbound transactional messages through custom email providers.
- Controlling LLM agent email access with granular quota limit structures.
Important Features
- BYO Infrastructure: Connects SES, Postmark, Google Workspace, and private relays.
- AI Parsing Layer: Strips formatting and headers to yield structured message objects.
- Agent Connectors: Features native MCP servers for Cursor and Claude integrations.
Current Updates About Sendmux
Sendmux has introduced a Node.js SDK and a CLI tool for easier local environment setups.
Alternatives to Sendmux
If you want to check similar software, these alternative tools offer comparative features:
- Resend, SendGrid, Amazon SES
Pricing Plans
| Plan | Price |
|---|---|
| FreeBasic API access, clean JSON email parsing, and single provider connection | $0 |
| ProUnlimited provider attachments, advanced routing, SSE channels, and volume pricing | Pay-as-you-go |