Sendmux is an email API designed specifically for AI agents, allowing efficient sending and receiving of emails.

How does Sendmux handle email routing?

Sendmux allows users to route emails through multiple providers with automatic failover and configurable quotas.

Can I use my own email provider?

Yes, Sendmux supports integration with your own email providers via SMTP or OAuth.

What formats does Sendmux support for emails?

Sendmux delivers emails in clean JSON format, stripping unnecessary HTML for easier processing.

Is there a free trial available?

Sendmux offers a pay-as-you-go model starting at $0.15 per 1,000 emails, with no subscriptions required.

How do I create an agent inbox?

You can create agent inboxes on verified domains or the provided @myagent.mx domain through the Sendmux API.

What happens if my email provider goes down?

Sendmux automatically reroutes traffic to healthy providers, ensuring continuous email delivery.

How does billing work?

Billing is usage-based, meaning you only pay for the emails sent without any per-mailbox or per-seat fees.

Can I manage multiple agent inboxes?

Yes, Sendmux allows you to manage multiple agent inboxes from a single interface.

What kind of support does Sendmux offer?

Sendmux provides comprehensive documentation and support for developers to integrate the API effectively.

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Sendmux

Name: Sendmux demo
Uploaded: 2026-07-15T01:05:35.750Z
Description: Sendmux provides a dedicated email API designed for AI agents. It allows developers to create agent inboxes, send emails through their own providers, and manage routing with flexibility. This tool is tailored for teams building AI-driven applications that require efficient email handling without the

Week 29, 2026

Email Inbox and Sending API for AI Agents

Jul 15, 2026#21Email, SaaS, Productivity

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Read the in-depth story behind Sendmux

Sendmux — Email Inbox and Sending API for AI Agents

About Sendmux

Sendmux provides a dedicated email API designed for AI agents. It allows developers to create agent inboxes, send emails through their own providers, and manage routing with flexibility. This tool is tailored for teams building AI-driven applications that require efficient email handling without the clutter of traditional email services. With Sendmux, users can create mailboxes on custom domains or the provided @myagent.mx domain. The API delivers clean, structured JSON responses, stripping away unnecessary HTML and focusing on the content that matters. This approach not only saves on token usage but also streamlines the email processing for AI agents, allowing them to act on information without getting bogged down by formatting issues.

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Demo video

Overview

Who is it for?

Developers and teams building AI applications requiring email integration.

Problem

Traditional email tools aren't designed for AI agents, leading to inefficiencies. Developers often need to stitch together multiple services for sending and receiving emails, which complicates integration and increases costs. Additionally, existing platforms limit flexibility in choosing providers and managing deliverability.

Solution

Sendmux consolidates email handling into one API, allowing users to send, receive, and route emails efficiently. It provides dedicated inboxes for agents and enables sending through various providers without being locked into a single service. The API simplifies email processing by delivering structured data, reducing token usage and improving performance for AI applications.

What makes it unique

Unlike competitors, Sendmux offers a unified solution for both sending and receiving emails tailored specifically for AI agents. It supports flexible provider routing, automatic failover, and usage-based billing without hidden fees. This makes it ideal for scaling applications without the typical constraints of traditional email services.

Use cases

1AI agent email handling
2Automated email responses
3Email routing management
4Bulk email processing

FAQ

What is Sendmux?: Sendmux is an email API designed specifically for AI agents, allowing efficient sending and receiving of emails.
How does Sendmux handle email routing?: Sendmux allows users to route emails through multiple providers with automatic failover and configurable quotas.
Can I use my own email provider?: Yes, Sendmux supports integration with your own email providers via SMTP or OAuth.
What formats does Sendmux support for emails?: Sendmux delivers emails in clean JSON format, stripping unnecessary HTML for easier processing.
Is there a free trial available?: Sendmux offers a pay-as-you-go model starting at $0.15 per 1,000 emails, with no subscriptions required.
How do I create an agent inbox?: You can create agent inboxes on verified domains or the provided @myagent.mx domain through the Sendmux API.
What happens if my email provider goes down?: Sendmux automatically reroutes traffic to healthy providers, ensuring continuous email delivery.
How does billing work?: Billing is usage-based, meaning you only pay for the emails sent without any per-mailbox or per-seat fees.
Can I manage multiple agent inboxes?: Yes, Sendmux allows you to manage multiple agent inboxes from a single interface.
What kind of support does Sendmux offer?: Sendmux provides comprehensive documentation and support for developers to integrate the API effectively.