Introducing Zoho AgentInbox: Email infrastructure built for AI agents

Most AI agents doing real work eventually need to send or receive email. The default move is to hand them access to someone’s existing inbox—either a shared address, a forwarded alias, or direct credentials to a human account. It works. At least for a while.

When an agent borrows a human mailbox, it inherits everything that comes with it: the account history, the recovery links, the legal accountability. Messages sent from that address are indistinguishable from messages the human sent. There is no clean audit trail. Revoking access is messy. And the inbox that serves as the recovery point for a half dozen critical services is now also the one your autonomous system has the keys to.

Agents are capable enough to run real workflows. They deserve infrastructure that treats them that way.

Today we're opening early access to Zoho AgentInbox: email infrastructure built exclusively for AI agents. Each agent gets its own mailbox, its own credentials, and a complete audit trail of everything it does.

What AgentInbox does  

AgentInbox provisions each agent with a dedicated mailbox. It owns a permanent address, isolated credentials, and a full log of every action it takes across sessions.

The agent is no longer a guest in someone else’s inbox. It has its own.

AgentInbox is designed for code, not for people managing a UI. Mailboxes are provisioned programmatically, credentials are issued per agent, and every capability is exposed over a REST API. Each agent maintains a persistent inbox and full conversation history, so it can send, receive, and act on replies without any human step in between.

What AgentInbox gives your agents  

An address it actually owns

Mailboxes are provisioned at runtime, scoped to a user, a workflow, or a single task run, and dropped when no longer needed. Incoming mail arrives as structured conversation threads, not a flat message stream, so the agent has full context before acting. Attachments are accessible the moment a message lands.

Delivery that holds up 

Reliable delivery is an infrastructure requirement, not a setting. AgentInbox handles SPF and DKIM authentication, isolates sending domains to prevent reputation bleed, and surfaces bounces, spam complaints, and failures in real time. Problems show up in your logs before they become a customer complaint.

Triggered by arrival, not a clock 

AgentInbox pushes events to your endpoint the moment something changes: a message arrives, a thread gets a reply, a delivery fails. Subscriptions are granular. Payloads are HMAC-signed for verification. Failed deliveries retry automatically with every attempt logged, so nothing disappears if your endpoint goes down.

Credentials scoped to each agent 

Each agent gets its own API key. Your outreach, support, and scheduling agents carry separate credentials with no overlap. Compromise one, revoke it—the others keep running. OAuth is available for user-delegated scenarios with tokens that rotate automatically. All data is encrypted with AES-256.

Works with your existing stack 

Every capability is available over a REST API. For MCP-compatible frameworks, a built-in MCP server lets agents call email capabilities as native tool calls. Python and Node.js SDKs and a CLI for terminal-based management are on the way.

A paper trail you can rely on 

Every outbound message has a full delivery trace from queue to open or bounce. Every API call is logged with its payload, response, latency, and the key that made it. Webhooks replay without re-triggering live actions. The dashboard gives a live view of volume, delivery health, and webhook performance.

What this looks like in practice  

When a sales agent runs outreach from its own address, prospects reply directly, teammates can CC it on threads, and every message is logged, timestamped, and traceable, with no manual activity mixed in.

For a customer onboarding agent taking over inbound from day one, reading the full thread before responding means customers are never asked to repeat themselves. When a conversation escalates, the human picking it up has full context from the start.

In both cases, the agent isn't a workflow someone has to trigger. It's reachable, accountable, and running its own queue.  

More on the way 

We're actively building out the AgentInbox ecosystem. Here's what's on the way:

Contacts and Calendar APIs are in the works, so agents handling threads will soon be able to book meetings and manage records within the same infrastructure.

The channel scope is expanding too. SMS, voice, and more such channels are coming soon.

We'll be rolling these out as early access progresses.

Getting started  

If your organization is building agents that touch email, AgentInbox is where they should be operating!

Sign up for early access, provision your first mailbox, and have an agent running on its own infrastructure in minutes. Our pricing page has everything you need to know about our plans and what they offer. Find the one that fits and get your agents where they belong.

Early access is the right time to shape what gets built next. If you have any feedback or feature requests, we'd love to hear them in the comments.