Sendmux
Email API for AI agents with mailboxes and provider failover
What it does
Sendmux is an email API for AI agents that combines real mailboxes with multi-provider outbound sending. Agents can send, receive, reply and read cleaned message content through APIs, webhooks, real-time events, MCP, SDKs and a CLI. Teams can route outbound mail through their own Gmail, Outlook or SMTP providers, with quotas, health checks and automatic failover. Pricing is usage-based, with no per-mailbox fees. Start with a free @myagent.mx mailbox.
Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.
Create agent inboxes, send through your providers, and route with quotas, weighted delivery, and failover from one API. # Give your OpenClaw agent a real inbox npx skills add Sendmux/skills # Then grant the tools, either: # → connect the hosted MCP endpoint (OAuth) # https://mcp.sendmux.ai/mcp # → or create a scoped API key in the dashboard # Skills teach the workflow; MCP or a key grants access. # Add the hosted MCP endpoint claude mcp add sendmux \ --transport http https://mcp.sendmux.ai/mcp ✓ server added · oauth flow opens in browser ✓ tools scoped to your grant # your agent now has Mailbox, Sending + Management tools # Install once npm i -g @sendmux/cli # Create a mailbox (management,…from sendmux.ai
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