Lumbox: The Action Layer for AI Agents
Lumbox is the action layer for AI agents. Give your agent a real email inbox, OTP and login automation, a stealth browser, and an encrypted credential vault, so it can sign up, get in, and act on its own. All from one API.
API-First Architecture
One POST to create an inbox. One GET to wait for an OTP. Full send, reply, and forward with threading headers. Works with any language. Just HTTP.
Automatic Data Extraction
Every incoming email is parsed automatically. OTP codes, verification links, magic links, backup codes, code expiry, category, and summary, all extracted and returned as clean JSON. No regex on your side.
One Inbox Per Agent
Each agent gets its own real email address. No shared inboxes, no cross-agent contamination. Create and delete via API.
IMAP Access
Connect Gmail, Outlook, Apple Mail, or any email client to monitor agent inboxes. IMAP server: imap.lumbox.co, SMTP server: smtp.lumbox.co.
73 MCP Tools
Native integration with Claude Code, Cursor, and any MCP-compatible AI agent framework.
Realtime Webhooks
Your agents react to incoming mail the moment it hits the server. Long-poll endpoints or webhooks, your choice.
Custom Domains
Bring your own domain with full DKIM, SPF, and DMARC setup. DNS records auto-generated.
Credential Vault
Store passwords with AES-256-GCM encryption. Agents use credentials in browser forms without ever seeing the plaintext.
Use Cases
OTP and 2FA verification: an agent signs up for a service, Lumbox receives the verification email, and the agent calls the OTP endpoint to get the code as JSON, with no polling loop. Browser automation: Playwright and Puppeteer agents handle email-based two-factor flows using a Lumbox inbox together with the encrypted credential vault. Agent-to-human communication: agents use a real, repliable address to talk to people and external services. Multi-agent systems: each agent gets its own isolated inbox, so there are no shared mailboxes and no cross-contamination. Email monitoring: connect an IMAP client such as Gmail or Outlook to watch agent inboxes in real time.
How Lumbox Compares
Unlike AgentMail, Lumbox automatically extracts OTP codes, verification links, magic links, and backup codes to JSON, offers long-poll and streaming endpoints, IMAP access, and self-hosting. Unlike Nylas, which connects an agent to a human's existing mailbox over OAuth, Lumbox provisions inboxes the agent owns outright with no human in the loop. Unlike Resend and Mailgun, which are outbound transactional sending APIs, Lumbox is the inbound and identity layer that handles receiving, parsing, and login automation. Unlike testing-focused tools such as MailSlurp and Mailtrap, Lumbox is production infrastructure with native MCP tools, a credential vault, and AI categorization. Detailed comparisons are available on the alternatives pages.
Security and Reliability
Stored credentials are encrypted with AES-256-GCM envelope encryption, scoped per organization, so they cannot be read back in plaintext. Incoming email is treated as untrusted input: attachment text is sanitized for prompt injection before it reaches an agent, and the structured parsed fields are what agents should act on. Webhook deliveries are signed with HMAC-SHA256 so receivers can verify authenticity. The API is rate limited with standard headers and supports idempotency keys so retries never act twice.
Pricing
Free: 3 inboxes, 500 emails received per month, 100 sent, no credit card. Starter: $9 per month, 10 inboxes, 5,000 received, 2,000 sent. Pro: $29 per month, 50 inboxes, 25,000 received, 10,000 sent, plus AI categorization. Scale: $99 per month, 250 inboxes, 100,000 received, 50,000 sent. The REST API and hosted MCP server are available on every tier including Free.
View full pricing
Get Started
Free to start. No credit card required. Sign up or read the documentation.
Frequently Asked Questions
Is there a service I can use to give my AI agent an email address?
Yes. Lumbox is email infrastructure built for AI agents. One API call creates an inbox your agent owns, and it automatically extracts OTPs, verification links and magic links to JSON so the agent can finish signups on its own.
How do I get email for my AI agent?
Create a Lumbox inbox with one POST request. Your agent gets a real email address, receives messages instantly, and waits for OTP codes with a single long-poll call. No IMAP loops and no mail server to run.
What is the best email API for an AI agent in 2026?
For an agent that needs its own inbox plus OTP extraction and login automation, Lumbox is purpose-built. There is a full comparison with AgentMail, Mailtrap, Postmark, Nylas and Resend at lumbox.co/alternatives.
Can an AI agent receive and read emails?
Yes. With Lumbox an agent receives email at its own address and every message is parsed to JSON, with OTP codes, links, attachments and a category extracted automatically. The agent can also send, reply and forward.
Do AI agents need their own email inbox?
When an agent signs up for services, handles verification, or holds multi-turn conversations, it needs an inbox it owns, separate from any human's. Lumbox gives each agent an isolated inbox via API.