AgentInbox is a REST API-first email infrastructure platform purpose-built to support AI agents in automating, sending, receiving, and managing email workflows without depending on human inboxes. Developed by Zoho, AgentInbox allocates each agent its own dedicated mailbox, control credentials, and audit trail, enabling applications and autonomous systems to engage in full email operations programmatically. Its design addresses challenges like accountability, domain reputation, and delivery issues that arise when AI agents share or hijack human email accounts.
Key Features
Agents each receive distinct mailboxes and credentials, avoiding shared access. Access keys are scoped and revocable per agent. AgentInbox supports OAuth where needed. Encryption uses TLS 1.3 and AES-256.
Emails can be sent, replied to, and received through RESTful APIs. AgentInbox supports intake of HTML and plain text emails, downloading and uploading attachments, threading by conversation, and domain setup with SPF, DKIM, and MX verification.
Real-time observability tools: dashboards show deliverability, inbox and domain status, webhooks health, bounce rates, and API performance. Detailed request and message logs, including timestamps, payloads, response codes, and latencies, aid debugging and auditing.
Webhooks emit instantaneous events on new emails, reply threads, and delivery failures; every webhook sent is HMAC-signed. Failed deliveries are retried automatically.
Data extraction features are built in for structured data like OTPs, magic links, verification codes, tracking numbers, invoice numbers, coupon codes, and password reset links. If built-in types do not match needs, fallback using LLM-based extraction is available.
SDKs for Python and Node.js are available to simplify integrations; the MCP (Model Context Protocol) server is included so agents built on compatible frameworks can handle email natively as a tool without custom glue code.
Pricing
AgentInbox offers a free tier and two paid plans with different limits and features.
Free: $0 forever. Allows up to 10 inboxes per day, 100 emails per day, and 200 API requests per day. Includes 3 webhooks and 1-day retention of inbox data. No credit card required for sign-up.
Plus: $10/month. Designed for solo developers and small agent projects. Offers 500 inboxes per day, 2,500 emails per day, 5,000 API requests per day, 250 webhooks, 7-day data retention, 5 API keys, LLM extraction, and email support.
Scale: $29/month. For production workloads or teams scaling up. Delivers 5,000 inboxes per day, 25,000 emails per day, 50,000 API requests per day, 2,500 webhooks, 30-day retention, 20 API keys, LLM extraction, priority support, and higher overall limits.
Who is it for?
AgentInbox generally fits businesses, teams, or software products that need scalable, reliable programmatic email for AI agents or automated workflows. Use cases include:
Customer support and ticketing agents that need to route incoming emails, escalate queries, reply from branded agent addresses, and keep full conversation context for handoffs.
Outbound sales or outreach automation that require tracking replies, maintaining consistent identities, extracting magic links or UTM codes, and avoiding shared inbox problems.
Internal automation in IT or HR for low-risk, high-volume tasks like password resets, request handling, or onboarding tasks, where structured data extraction and automated responses speed up replies.
QA, monitoring, and continuous integration pipelines where temporary or disposable inboxes are needed to test email flows, verify integrations, or simulate user interactions.
Development and product teams building AI agents, workflow automations, or agentic systems, especially where email infrastructure such as sending, receiving, domain reputation, and observability is non-trivial.
Roles who will find AgentInbox most relevant include engineering leads, AI and ML architects, product managers overseeing automation, DevOps, and operations teams responsible for communication compliance.
Final thoughts
AgentInbox delivers a robust, infrastructure-grade solution for businesses building AI agents that depend on email communication. Its separation of agent identities, detailed observability, structured data extraction, and real-time webhook support all address common pain points in agent email workflows. For organizations with moderate to high volumes of automated email interaction, its paid tiers offer clear scale; smaller teams can test via the free tier without upfront cost. Limitations to review include the fixed retention periods tied to plan levels and the built-in extraction types; customization beyond those may require additional tooling. Nonetheless, AgentInbox is a dependable choice when you want email capabilities tailored not just for humans, but for autonomous systems operating in production.
Visit the official website for more.
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