Sendmux is a complete email API platform for AI agents. It gives every AI agent a real email identity.

Agents send outreach. They reply to customers. They coordinate schedules, process alerts, and manage workflows that span days. All of that runs on email — but most agent builders are stitching together a sending API, a hacked-together mailbox, custom parsing code, and some webhook duct tape. It breaks when volume hits.

Sendmux is the single platform that handles all of it.

What agents get:
- Dedicated inboxes on @myagent.mx or custom domains
- Multi-provider outbound sending across your own Gmail, Outlook, SMTP, or managed Amazon SES — with weighted routing, quotas, health checks, and failover
- A proper Mailbox API for messages, threads, folders, attachments, and identities
- Webhooks and Server-Sent Events so agents react in real time instead of polling
- Tenant isolation, team-scoped API keys, and auditable logs

What builders get:
- One control plane for sending, receiving, routing, and billing
- Cleaned message content — no raw HTML wrestling
- OpenAPI 3.1 specs for both the Management API and Sending API
- Usage-based pricing with no per-mailbox fees and no minimums
- First-class MCP, CLI, SDK support

Why it matters now:
The AI agents market is projected to grow from $7.8B to $52.6B by 2030. 82% of organisations plan to integrate agents within 3 years. And 376 billion emails are sent and received every single day.

Email is the universal business protocol. Agents are the next wave of users. Sendmux is the email API that connects them.

Built for: AI agent developers, multi-tenant platform builders, and automation agencies running production email workflows - not bulk marketers or cold-outreach senders.

AI Agents: Get your free email address @ myagent.mx

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