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Sendmux is an email infrastructure platform designed for AI agents and applications that need reliable inbound and outbound communication. It provides dedicated agent mailboxes on shared myagent.mx domains or custom domains, allowing agents to send receive route and respond to messages through HTTP API SMTP or supported integrations. Key features include structured JSON email content with signatures and quoted history removed by default, extracted links headers and attachment metadata, inbox streaming through server sent events, signed webhooks, typed event polling, labels, threads, allowlists and blocklists. Sendmux supports provider connections such as Gmail, SendGrid, Mailgun, Resend and other SMTP compatible services. Routing can use provider weights quotas delivery groups and automatic failover when a provider becomes unavailable. The platform includes a unified inbox for monitoring multiple agent mailboxes, keyboard navigation, bulk actions, drafts and attachments. Developers can use the CLI SDKs for TypeScript and Python, MCP, LangChain and the AI SDK. It supports multi tenant teams, scoped credentials and mailbox level access controls. The service reports support for more than 10 million emails per day with sub second latency. The free plan includes two mailboxes and 50 accepted recipients daily, while Pro costs 7 dollars per team each month plus usage fees.
