Sendmux

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.

Let your AI agents send and receive email, manage calendars, and store files through one API. Sending services handle outbound. Inbox providers handle receiving. You stitch together two or three services, manage separate APIs, and pay separate bills. Gmail and Outlook return full HTML email bodies that consume thousands of LLM tokens. Your agents waste compute parsing formatting instead of acting on content. Current platforms lock you into their sending infrastructure. If deliverability degrades, you're stuck. No way to bring your own providers or route across multiple accounts. One API surface for outbound mail, agent mailboxes, routing controls, and delivery events. Create mailboxes on…from sendmux.ai

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