Sendmux
Email inbox API for AI agents. Create agent mailboxes, receive live inbox events, route your emails.
Sendmux gives AI agents their own inbox and a controlled way to send email. Each agent can receive messages, read threads, handle attachments, send replies, and react to new mail through signed webhooks or Server-Sent Events.
Teams can send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Sendmux can spread sending across providers with weighted routing, sender-domain routing, health checks, failover, and quotas by second, minute, hour, or day.
Developers get Mailbox, Sending, and Management APIs, OpenAPI docs, SDKs, the sendmux CLI, MCP tools, and Sendmux Skills. The platform also covers tenant isolation, mailbox-scoped API keys, custom domains, logs, metrics, and usage-based pricing with no per-seat or per-mailbox fees.
Teams can send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Sendmux can spread sending across providers with weighted routing, sender-domain routing, health checks, failover, and quotas by second, minute, hour, or day.
Developers get Mailbox, Sending, and Management APIs, OpenAPI docs, SDKs, the sendmux CLI, MCP tools, and Sendmux Skills. The platform also covers tenant isolation, mailbox-scoped API keys, custom domains, logs, metrics, and usage-based pricing with no per-seat or per-mailbox fees.
2013
Australia
- Computer-software
- Information-technology-services
- Marketing-advertising
- English
Industries
- Computer-software
- Information-technology-services
- Marketing-advertising
Licensing & Deployment
- Proprietary
- Cloud Hosted
Support
- Email
- Chat
- 24x7 Support
Training
- In-person
- Documentation
Knowledge Base
Media
Sendmux Core Features
Focus of AI Agent Builders Feature
- Workflow Automation & Integrations
- Security & Compliance Features
- Personalization & User Profiling
- Analytics & Reporting
- API & Webhook Support
- Agent Creation & Management
- Pre-Built Templates & Customization
Sendmux Pricing
Pricing Type
- Usage Based
Preferred Currency
- USD ($)
Free Version
- Yes
Payment Frequency
- Quote Based
- One-Time Payment
Pricing Description
Sendmux pricing is built for AI agent teams that want real inboxes, controlled sending, and live email events without seat or mailbox charges. Standard inbound email and outbound email through your own providers cost $0.15 per 1,000 messages. Managed Amazon SES sending costs $0.25 per 1,000 messages. Mailbox storage is $0.02 per GB per month. There are no minimum commitments, and new teams can start with a managed Amazon SES route capped at 50 emails per day without a credit card.
