# Sendmux

Según la telemetría de OpenAITools.app verificada el 2026-11-11, Sendmux (sendmux.ai) es una plataforma de IA indexada en Herramientas de desarrollo con IA (puesto n.º 207 a nivel global) que genera 37 visitas mensuales con una variación de tráfico intermensual de -2,2 mil (-98,3 %). Su principal mercado geográfico es Estados Unidos (100 % de cuota de tráfico), y opera con un modelo de precios Gratis. Entre las principales alternativas competidoras por volumen mensual se incluyen Morph (306,96 mil visitas/mes), Carly AI (340 mil visitas/mes), Respan (91,5 mil visitas/mes).

Sendmux is an email API built for AI agents. It gives each agent a real mailbox on a verified domain or a shared address, lets it send outbound mail through your own providers, and streams inbox events live so agents can react instead of polling.

## Telemetría y especificaciones clave

| Métrica | Valor |
| :--- | :--- |
| Nombre de la herramienta | Sendmux |
| Identificador | sendmux |
| Status | active |
| Origin | independent |
| Maintenance | active |
| Dominio oficial | sendmux.ai |
| URL del sitio web | https://sendmux.ai |
| Categorías | Herramientas de desarrollo con IA, AI Workflow, Asistente de correo con IA |
| Modelo de precios | Gratis |
| Visitas mensuales | 37 |
| Variación de tráfico intermensual | -2196 |
| Tasa de crecimiento intermensual | -98,3 % |
| Mercado principal | Estados Unidos |
| Cuota de mercado | 100 % |
| Visitas directas | 12 |
| Visitas de búsqueda orgánica | — |
| Visitas desde redes sociales | — |
| Visitas por referidos | 5 |
| Visitas por email | 2 |
| Puntuación de reseñas | 4,2 |
| Número de guardados | 0 |
| Plataformas compatibles | Sitio web |
| Plataformas de facturación |  |
| Atributos | Funciones: Sitio web; Precios: Gratis |
| Etiquetas | API de bandeja de entrada, agentes de IA, Asistente de correo con IA, Herramientas para desarrolladores con IA, Buzones para agentes, API de correo, SMTP API, MCP, Webhooks, SSE, SDK, CLI, Gmail, Outlook, Amazon SES, Automatización de correo |

## Resumen

Sendmux is an email API built for AI agents. It gives each agent a real mailbox on a verified domain or a shared address, lets it send outbound mail through your own providers, and streams inbox events live so agents can react instead of polling.

## Precios y planes

Sendmux is listed as free, with two free mailboxes available to start and agent onboarding designed to be self-service. Pricing beyond the initial free mailboxes is not detailed on the landing page, so check the pricing page for current tiers.

## Funciones y capacidades clave

- **Agent mailboxes:** Provision mailboxes on verified domains or a shared myagent.mx address, with clean JSON output that strips signatures and quotes.
- **Provider-flexible sending:** Send over HTTP or SMTP using the same mailbox credential as a Bearer token and SMTP password, with Idempotency-Key retries and attachment support.
- **Routing controls:** Bind keys to providers, delivery groups, weights, and quota windows so traffic stays inside the boundaries you set.
- **Real-time events:** Signed webhooks for delivery and receipt events, an SSE stream for live mailbox clients, and typed change polling for resync.
- **Developer tooling:** Official SDKs for TypeScript and Python, a CLI, LangChain and AI SDK integrations, and a hosted MCP endpoint with OAuth.

## Casos de uso principales

- **Triage an inbound support inbox (Support automation):** Give a support or triage agent its own mailbox, feed it stripped-down message content, and let it reply through the same API.
- **Wire transactional email into an app (Product engineers):** Send transactional mail from an agent over HTTP with idempotency keys, and receive bounce or reply events via webhooks.
- **Spread delivery across providers (Platform teams):** Route sends across multiple providers with weights and quotas so no single account carries all the volume or risk.

## Fortalezas

- One API for sending, receiving, routing, and events
- Inbox payloads tuned for LLM token efficiency
- Not locked to a single sending provider
- Practical developer tooling: SDKs, CLI, MCP, framework integrations

## Limitaciones

- Newer platform, so the surrounding ecosystem and community material are still small
- Using your own sending providers puts deliverability and domain reputation on you
- Agent mailboxes still depend on correct DNS setup for verified domains

## Preguntas frecuentes

### What exactly does an agent mailbox mean?
Sendmux provides agent-shaped mailboxes. You can create mailboxes on a verified domain you own or on a shared myagent.mx address, and the agent can both send from and receive at that mailbox.

### How does Sendmux reduce token costs for agents?
When your agent reads a message, Sendmux can strip signatures and quoted history by default, with links, headers, and attachment metadata available on request. That keeps token usage down and gives the model actionable content instead of raw HTML.

### Can I route across multiple email providers?
Yes. Bind a mailbox key to all of your active providers, to selected providers, or to delivery groups, with percentage weights and second/minute/hour/day quota windows controlling how traffic is distributed.

### Is Sendmux free to try?
Two free mailboxes are offered to start. The site is designed for agents to self-onboard: point an agent at the auth instructions or install the Sendmux skills, then connect via MCP or a scoped API key.

### ¿Cuál es el tráfico mensual y la tendencia de crecimiento de Sendmux?
Sendmux recibe actualmente 37 visitas mensuales, con una variación de tráfico intermensual de -2,2 mil (tasa de crecimiento del -98,3 %). Su principal mercado de origen es Estados Unidos (100 % de cuota), con 12 visitas directas/mes y — visitas de búsqueda orgánica/mes.

### ¿Sendmux es gratis? ¿Cuál es su modelo de precios?
Sendmux opera con un modelo de precios Gratis. Sendmux is listed as free, with two free mailboxes available to start and agent onboarding designed to be self-service. Pricing beyond the initial free mailboxes is not detailed on the landing page, so check the pricing page for current tiers. Las plataformas de facturación y pago compatibles incluyen: no indicado.

### ¿Cuáles son las mejores alternativas a Sendmux en 2026?
Según el tráfico por categoría y el ajuste de funciones de OpenAITools.app, las cinco mejores alternativas a Sendmux son: 1. Morph (306,96 mil visitas/mes); 2. Carly AI (340 mil visitas/mes); 3. Respan (91,5 mil visitas/mes); 4. Portkey (195,65 mil visitas/mes); 5. Merge (313,2 mil visitas/mes).

### ¿Qué plataformas y capacidades de IA principales admite Sendmux?
Sendmux está clasificada en Herramientas de desarrollo con IA, AI Workflow, Asistente de correo con IA, es compatible con las siguientes plataformas: Sitio web, y sus etiquetas de capacidades principales incluyen: API de bandeja de entrada, agentes de IA, Asistente de correo con IA, Herramientas para desarrolladores con IA, Buzones para agentes, API de correo.

## Alternativas

| Nombre de la herramienta | Visitas mensuales | Modelo de precios | Comparar |
| :--- | :--- | :--- | :--- |
| [Morph](https://openaitools.app/es/tool/morph-apply-ai-edits-to-files-fast) | 306.961 | Prueba gratuita, Precio a consultar | [Comparar](https://openaitools.app/es/compare/morph-apply-ai-edits-to-files-fast-vs-sendmux) |
| [Carly AI](https://openaitools.app/es/tool/carly-ai) | 340.001 | Freemium | [Comparar](https://openaitools.app/es/compare/carly-ai-vs-sendmux) |
| [Respan](https://openaitools.app/es/tool/respan) | 91.503 | Freemium | [Comparar](https://openaitools.app/es/compare/respan-vs-sendmux) |
| [Portkey](https://openaitools.app/es/tool/portkey-ai) | 195.650 | Freemium, De pago, Precio a consultar | [Comparar](https://openaitools.app/es/compare/portkey-ai-vs-sendmux) |
| [Merge](https://openaitools.app/es/tool/merge-dev) | 313.201 | Freemium, Precio a consultar | [Comparar](https://openaitools.app/es/compare/merge-dev-vs-sendmux) |
| [DogeSMS](https://openaitools.app/es/tool/dogesms) | 96.418 | Pay-as-you-go | [Comparar](https://openaitools.app/es/compare/dogesms-vs-sendmux) |
| [Missive](https://openaitools.app/es/tool/missive) | 631.353 | Prueba gratuita, De pago | [Comparar](https://openaitools.app/es/compare/missive-vs-sendmux) |
| [Pipedream](https://openaitools.app/es/tool/pipedream) | 312.216 | Freemium, De pago, Precio a consultar | [Comparar](https://openaitools.app/es/compare/pipedream-vs-sendmux) |
| [AutoSend](https://openaitools.app/es/tool/autosend) | 12.928 | De pago, Precio a consultar | [Comparar](https://openaitools.app/es/compare/autosend-vs-sendmux) |
| [iGPT](https://openaitools.app/es/tool/igpt-1) | 5904 | Precio a consultar | [Comparar](https://openaitools.app/es/compare/igpt-1-vs-sendmux) |
| [RightNow Inference (RunInfra)](https://openaitools.app/es/tool/runinfra) | 18.110 | Prueba gratuita, De pago, Precio a consultar | [Comparar](https://openaitools.app/es/compare/runinfra-vs-sendmux) |
| [BeatAPI](https://openaitools.app/es/tool/beatapi-ai-model-data-web-apis-for-agents) | 99.987 | Freemium | [Comparar](https://openaitools.app/es/compare/beatapi-ai-model-data-web-apis-for-agents-vs-sendmux) |

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Fuente: https://openaitools.app/es/tool/sendmux