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Sendmux

Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.

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Overview

Sendmux is an email API that gives every AI agent a real inbox. Send and receive, route outbound through your own providers, and fail over automatically.

AI summary

Sendmux is an email API designed to provide AI agents with dedicated inboxes, enabling them to send and receive emails while allowing users to route outbound messages through their own email providers. It supports features like automatic failover, usage-based billing, and multi-tenancy for teams.

Who Is It For

Best for

Companies looking to integrate email capabilities into AI agents, particularly those needing flexibility in email routing and management.

Not for

Organizations that require traditional email services without AI integration or those looking for a fully managed email solution without custom provider integration.

Strengths & Weaknesses

Biggest strength

The ability to create dedicated inboxes for AI agents and route outbound emails through various providers with automatic failover and flexible quotas.

Biggest weakness

Pricing details are not clearly visible, which may hinder decision-making for potential users. (AI-inferred; may be outdated – founders can correct this)

Classification

Likely competitors
SendGridMailgunGmail APIAmazon SES

Alternatives to Sendmux

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How we sourced this: Observed fields () were crawled from https://sendmux.ai/ and are stated as fact. AI-inferred fields () were generated by gpt-4o-mini and are always labelled – never presented as measured fact. Last updated: 16 August 2026. Is this your tool? Claim it to edit and get a do-follow badge.