Sendmux
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Introduction
Email API for AI agents with real inboxes, clean JSON, and multi-provider routing.
Listed on
July 27, 2026
What is Sendmux?
Sendmux is an email API designed for AI agents, providing each agent with a real inbox. It handles both outbound sending and inbound mailboxes from a single endpoint, supporting multiple providers like SMTP, Gmail OAuth, Microsoft 365, and Amazon SES. The platform parses incoming emails into clean JSON, stripping noise to save LLM tokens.
How to use Sendmux?
- Start by signing up and getting an API key. Create a mailbox via the dashboard or CLI, then use the SDKs (TypeScript, Python, LangChain, AI SDK) or MCP to integrate sending and receiving into your agent. Configure routing rules for providers and quotas, and stream incoming messages via SSE or webhooks.
Core features of Sendmux
- Multi-provider sending with weighted routing and auto-failover
- Inbound mailboxes with clean JSON parsing (strips signatures, quotes, tracking pixels)
- Token-saving extraction reduces LLM tokens by up to 80%
- Thread grouping by Message-ID and References
- Custom domains with SPF, DKIM, DMARC
- Team and mailbox-scoped API keys with granular permissions
- Signed webhooks and Server-Sent Events streaming
- Usage-based pricing with no seat fees
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