What is Sendmux AI?
Sendmux is a unified email 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 pricing Freemium
Verify on the official pricing page.
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Sendmux AI's key features
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Unified email API handling inbound, outbound, routing, and delivery events
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Endpoints returning raw and cleaned JSON email bodies (text, HTML, links, headers, attachment metadata)
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Routing controls with provider weights, quotas, delivery groups, and failover across multiple sending providers
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Outbound sending via HTTP and SMTP with idempotency keys, custom headers, text/HTML bodies, and attachment support
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Realtime integrations using signed webhooks and Server-Sent Events (SSE) for delivery, receipt, and spam notifications
Sendmux AI use cases
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Create AI-driven customer support inboxes using agent-shaped mailboxes that convert inbound emails and attachments into cleaned JSON bodies, route conversations across providers with weights, quotas and failover, and push realtime events via signed webhooks or SSE so agents respond instantly
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Automate transactional email delivery for AI agents with idempotent sending, multi-provider routing to maximize deliverability, attachment support and delivery webhooks for accurate tracking, retries and reporting
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Build internal workflow and triage systems where incoming emails are normalized to JSON for downstream AI processing, routing rules allocate load by weight/quotas, and realtime SSE/webhooks trigger orchestration, auditing and analytics pipelines
Who is it 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
