Sendmux is an email inbox API for AI agents, combining agent mailboxes, outbound sending, routing, webhooks, SSE, MCP, SDKs, and CLI access.

Sendmux is for AI agent builders, technical founders, backend engineers, SaaS platforms, and automation agencies that need agents to send and receive real email.

Can Sendmux receive email?

Yes. Sendmux provides dedicated agent mailboxes with message, thread, attachment, folder, and metadata access through the Mailbox API.

Which sending providers does Sendmux support?

Sendmux supports SMTP providers, Gmail OAuth, Outlook OAuth, and Sendmux-managed Amazon SES.

Does Sendmux support live inbox events?

Yes. Sendmux supports signed webhooks and Server-Sent Events for live mailbox and delivery events.

Does Sendmux offer an API?

Yes. Sendmux offers Management, Sending, and Mailbox APIs with OpenAPI specs, SDKs, CLI, MCP tools, webhooks, SMTP, IMAP, and SSE.

How does Sendmux pricing work?

Pricing is usage-based: $0.15 per 1,000 standard incoming or outgoing emails, $0.25 per 1,000 managed Amazon SES sends, and $0.02 per GB per month for storage.

Can Sendmux be used for cold email?

Yes, if teams bring their own sending providers and manage their own compliance, warmup, and deliverability. Sendmux provides routing, quotas, and sending controls, not campaign management.

Sendmux: Sendmux is an email inbox API for AI agents. It gives agents dedicated mailboxes, multi-provider sending, live inbox events, and developer tools so they can send, receive, route, and react to email in production.

Name: Sendmux
Rating: 5 (100 reviews)
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Introduction:

Sendmux is an email inbox API for AI agents. It gives agents dedicated mailboxes, multi-provider sending, live inbox events, and developer tools so they can send, receive, route, and react to email in production.

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Jun 30 2026

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Sendmux Product Information

What is Sendmux?

Sendmux helps developers give AI agents a real email identity. Instead of stitching together a sending API, mailbox provider, parser, webhook layer, and billing system, teams can use one platform for inbound mailboxes, outbound sending, routing, quotas, webhooks, and live inbox events. Agents can receive email in dedicated mailboxes, read messages and threads, process attachments, send replies, and stream inbox activity through Server-Sent Events. Outbound sending supports SMTP, Gmail OAuth, Outlook OAuth, and Sendmux-managed Amazon SES, with delivery groups, weighted routing, per-provider quotas, health checks, and failover. Sendmux is built for AI agent teams, automation agencies, SaaS platforms, and developers building support agents, sales agents, scheduling agents, monitoring agents, and workflow agents. It also includes REST APIs, OpenAPI specs, SDKs, CLI, MCP tools, and Sendmux Skills.

How to use Sendmux?

Create a Sendmux team, then create an agent mailbox using the included myagent.mx domain or a verified custom domain. Connect SMTP, Gmail OAuth, Outlook OAuth, or managed Amazon SES for outbound sending. Generate team-level or mailbox-scoped API keys, then use the API, SDKs, CLI, MCP, or Sendmux Skills to send, receive, route, and monitor email. Subscribe to webhooks or Server-Sent Events to watch live inbox and delivery events.

Sendmux's Core Features

Email inbox API for AI agents

Dedicated agent mailboxes

Multi-provider email sending

Managed Amazon SES sending

Per-provider quotas and throttling

Weighted routing and failover

Signed webhooks and SSE events

Mailbox API for threads and attachments

MCP, SDKs, CLI, and Sendmux Skills

Usage-based pricing with no mailbox fees

Sendmux's Use Cases

AI customer support agents with real inboxes

Sales and outreach agents using customer-owned providers

Scheduling and executive-assistant agents

Research and monitoring agents that process email updates

Ops, finance, and vendor workflow agents

Multi-tenant SaaS platforms needing isolated mailboxes

Automation agencies managing client email workflows

Internal tools that need webhook-driven email automation

FAQ from Sendmux

What is Sendmux?
Who is Sendmux for?
Can Sendmux receive email?
Which sending providers does Sendmux support?
Does Sendmux support live inbox events?
Does Sendmux offer an API?
How does Sendmux pricing work?
Can Sendmux be used for cold email?

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