What is Sendmux AI?
Sendmux is a unified email inbox API for AI agents that handles inbound, outbound, routing, and delivery events; site pages render main content without JavaScript.Developer-focused features include agent-shaped mailboxes, verified domains, and endpoints that return raw and cleaned JSON email bodies (text, HTML, links, headers, attachment metadata) to reduce LLM token consumption and simplify parsing.
Routing controls support provider weights, quotas (second/minute/hour/day), delivery groups and failover to route traffic across multiple sending providers without provider lock-in.Outbound sending supports HTTP and SMTP, idempotency keys for safe retries, text/HTML bodies, custom headers, and attachment support.
Realtime integrations include signed webhooks and Server-Sent Events (SSE) for delivery, receipt, and spam notifications so agents and clients can react without polling.API surface includes mailbox message content endpoints, batch actions, event streams, and delivery events for automating inbox workflows and improving deliverability and routing management.
Sendmux AI details
- Company
- Jonah and Associates Pty Ltd
- Jurisdiction
- Victoria, Australia
- Built for
- Developers
- Data residency
- European Union
- Stated compliance
- GDPR
Compliance as stated in Sendmux AI's own published documentation.
Sendmux AI tech specs
- Works with
- OpenAI / GPT Anthropic / Claude
- Integrations
- Google Workspace
Sendmux AI pricing
Freemium- Auto-renewal
- Yes
Verify on the official pricing page.
View plansSendmux AI's key features
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Email Inbox API for AI Agents
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Dedicated Agent Mailboxes
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Mailbox History for Agent Memory
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Multi-Provider Email Sending
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Managed Amazon SES Sending
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Per-Provider Quotas and Throttling
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Weighted Routing and Failover
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Signed Webhooks and SSE Events
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MCP, SDKs, and CLI
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Usage-Based Pricing, No Mailbox Fees
Sendmux AI use cases
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Long-Term Agent Email Memory - Use the Mailbox API to let agents retrieve past threads, attachments, cleaned message text, and raw email history, then answer with context from every message available to that agent mailbox.
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Multi-Provider Email Sending - Send email through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES, with weighted routing, failover, and per-provider throttling by second, minute, hour, and day.
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Live Agent Inbox Events - Connect agents through MCP, SDKs, CLI, webhooks, and Server-Sent Events so they can receive live inbox events, inspect mailbox activity, and act on new email in real time.
Sendmux AI user reviews
Based on 2 reviews, 100% of users recommend Sendmux AI, rated highly for feature coverage.
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Who is Sendmux AI for?
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Email api developers
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Email infrastructure engineers
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Automation engineers
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Real-time integration engineers
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Mail routing engineers
Sendmux AI FAQ
Is Sendmux AI free?
Partly. Sendmux AI has a free plan with usage limits, and paid plans unlock the full feature set. Plans include Mailbox storage at $0.02 per gb/mo, Standard email at $0.15 per 1000 emails and Managed amazon ses at $0.25 per 1000 emails.
Is Sendmux AI safe to use?
Sendmux AI states GDPR compliance in its own published documentation. Sendmux AI is operated by Jonah and Associates Pty Ltd, registered in Victoria, Australia.
What are the best alternatives to Sendmux AI?
The closest alternatives to Sendmux AI are Instantly, Abnormal AI, Hi AI, Inboxly ai and Upstream. You can compare them side by side in the alternatives section further down this page.
What does Sendmux AI do with my data?
Sendmux AI states that customer content is not used to train its models. Its privacy policy states that personal data is not sold or shared for marketing purposes. Data may be shared with third-party service providers that help run the product. Customer data is held in European Union.
Does Sendmux AI auto-renew or offer refunds?
Sendmux AI subscriptions renew automatically until you cancel.
Does Sendmux AI have an API?
Yes. Sendmux AI offers an API, so you can call it from your own applications instead of using the interface directly.
Who made Sendmux AI?
Sendmux AI is built and operated by Jonah and Associates Pty Ltd, a company registered in Victoria, Australia.
Which AI models does Sendmux AI use?
Sendmux AI is built on OpenAI / GPT and Anthropic / Claude. Which models you can reach may depend on your plan.
What does Sendmux AI integrate with?
Sendmux AI connects with Google Workspace.
Compliance, privacy and billing terms are as stated in each product's own published documentation and have not been independently verified by TopAI.tools.
