Sendmux

Sendmux is an email API for AI agents and software applications that need to send, receive, and manage email through a unified platform. It provides dedicated agent inboxes, outbound email delivery, provider routing, and event-based automation through HTTP API, SMTP, SDK, CLI, and MCP integrations. (sendmux.ai)

Create inboxes on a shared domain or custom domain and receive messages as structured JSON instead of raw HTML. Sendmux can remove signatures and quoted history, while keeping links, headers, and attachment metadata available when needed. The platform also supports threads, labels, allowlists, blocklists, batch actions, search across inboxes, attachments, and team visibility through a unified inbox. (sendmux.ai)

For outbound email, Sendmux works with providers such as Gmail, SendGrid, Mailgun, Resend, and other SMTP-compatible services. Its routing tools support provider weights, delivery groups, quotas, health monitoring, and automatic failover. Signed webhooks, Server-Sent Events, and typed polling help applications respond to delivery updates, received messages, spam events, and mailbox changes without relying on continuous polling loops. (sendmux.ai)

Sendmux also includes multi-tenant workspaces, inbox-scoped API keys, provider and quota isolation, delivery logs, and metrics for teams building customer-facing AI agent platforms. It is designed for use cases such as customer support automation, sales outreach, scheduling, transactional email, and other workflows that require reliable programmatic email communication. (sendmux.ai)

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