Sendmux

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Email inbox API for AI agents. Create agent mailboxes, receive live inbox events.

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Sendmux Overview

Sendmux is the email inbox API for AI agents. It gives agents dedicated mailboxes, cleaned message content, threads, attachments, mailbox-scoped API keys, webhooks, and Server-Sent Events so agents can receive and act on email in real time. For sending, Sendmux lets teams connect Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Delivery groups support weighted routing, sender-domain routing, per-provider quotas from per second to per day, provider health checks, and automatic failover, so teams can keep control of outbound email instead of relying on one sending provider. Developers can use the Mailbox API, Sending API, Management API, OpenAPI docs, SDKs for TypeScript, Python, Go, PHP, and Ruby, the sendmux CLI.

How to evaluate Sendmux for email workflows

Sendmux is listed as a freemium email AI agent with closed source access. Use this page to compare its core capabilities, practical use cases, pricing model, and alternatives before adding it to your workflow.

A strong first-fit use case is Remember every conversation long-term memory, especially if your team is shortlisting email tools for a specific operational need.

Best-fit checks before choosing:

Confirm that freemium pricing matches your expected usage volume.
Compare Sendmux with similar email AI agents in the alternatives section.
Validate the key capability: Email Inbox API for AI Agents.

Sendmux Key Features

Email Inbox API for AI Agents

Dedicated Agent Mailboxes

Mailbox History for Agent Memory

Multi-Provider Email Sending

Managed Amazon SES Sending

Per-Provider Quotas and Throttling

Weighted Routing and Failover

Signed Webhooks and SSE Events

MCP, SDKs, Skills, and CLI

Usage-Based Pricing, No Mailbox Fees

Sendmux Use Cases

Remember every conversation long-term memory

Talk to systems without API

Email tasks to your agents

Trigger workflows from emails

Quick Facts

CategoryEmail

IndustryHorizontal

AccessClosed Source

Pricing

Freemium

StatusPremium · New

ListedJun 26, 2026

Popularity0%

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