Issue a real inbox.
Create an address for one agent, one workflow, or an entire fleet. Each mailbox is isolated inside your tenant.
POST /v1/inboxesEmail infrastructure for AI
An inbox for every agent. Control for every human.
Give agents a real email address, threaded conversations, and an API to reply—while your team keeps policies, delivery history, and audit visibility.
No credit card required · Start with 2 mailboxes
Agent mailbox
03 unreadconcierge@reverbin.com
email.received → agent runtime
signature verified · thread_7k2 · delivery attempt 1
From address to action
Email that fits the way agents work.
A clean interface for the outside world. Structured events and durable context on the inside.
Turn mail into an event.
Messages arrive as signed webhook events with the sender, subject, body, attachments, and conversation context your runtime needs.
email.received · HMAC signedContinue the thread.
Let the agent reply through the API. Reverbin preserves the thread, applies policy, and leaves a delivery record a human can inspect.
POST /v1/threads/:id/replyOne system, two points of view
Autonomy without the blind spot.
Agents get a simple interface to the world. Humans keep the context and controls that make automation trustworthy.
A native communication layer.
Receive mail, understand the full thread, and reply through a predictable API—without borrowing a person's mailbox or credentials.
- Dedicated email addresses
- Threaded message history
- Structured webhook payloads
- Attachments and forwarding
Visibility when it matters.
See what arrived, what the agent sent, and where delivery failed. Add policies and approval steps around sensitive actions.
- Operator inbox and sent views
- Delivery attempt history
- Send policies and approvals
- Audit-ready activity records
Built for real workflows
Where agents meet the inbox.
Use Reverbin anywhere an automated system needs to communicate with people and businesses on their own terms.
01 / Customer operationsSupport
Support that can own the conversation.
Give a service agent durable threads for customer questions, follow-ups, and escalation to a human operator.
02 / Browser agentsAccess
Verification without a borrowed inbox.
Route onboarding and account mail to a purpose-built address instead of sharing access to a personal or team mailbox.
03 / Back officeOperations
Vendor, invoice, and procurement workflows.
Keep receipts, invoices, questions, and follow-ups in an inspectable record tied to the agent doing the work.
04 / Internal toolsHandoff
Routine replies with a human escape hatch.
Automate the predictable path, hold risky sends for approval, and hand the complete conversation to a person when needed.
Security & operations
Control is part of the protocol.
Email can trigger consequential actions. Reverbin gives teams the primitives to verify, constrain, and review agent communication.
delivery loglive
12:04:08 webhook.verified
12:04:08 policy.evaluate allow
12:04:09 thread.updated thr_7k2
12:04:09 delivery.complete 200
12:04:08 policy.evaluate allow
12:04:09 thread.updated thr_7k2
12:04:09 delivery.complete 200
Signed inbound events
HMAC signatures let your runtime authenticate Reverbin events before processing message content.
Scoped access
Tenant-specific API keys maintain clear boundaries between teams, environments, and agent fleets.
Policy-aware sending
Apply recipient and sending rules, or route sensitive messages into a human approval workflow.
Delivery history
Inspect webhook attempts and outbound activity so failures are visible and recoverable.
Durable audit trail
Preserve the relationship between inboxes, threads, messages, agent actions, and operator decisions.
Straightforward pricing
Start with one workflow. Scale to a fleet.
Every plan includes real inboxes, the API, threaded conversations, and signed webhook events.
$0 / month
Test a real agent workflow before committing to paid volume.
- 2 mailboxes
- 2,000 emails / month
- 1 webhook endpoint
$19 / month
For solo builders shipping production agent email flows.
- 10 mailboxes
- 10,000 emails / month
- 3 webhook endpoints
- API keys and audit logs
$149 / month
For teams running multiple agents and higher-volume workflows.
- 100 mailboxes
- 100,000 emails / month
- 10 webhook endpoints
- Priority support
Custom
Custom domains, volume, deployment needs, and support.
- Custom mailboxes
- Custom volume
- Custom support
Paid plans are managed securely through hosted billing. Limits are monthly and subject to the Terms of Service.
Is Reverbin an email client for people?
Reverbin is email infrastructure built for AI agents, with an operator interface for the humans responsible for them. Agents use the API and webhooks; humans can inspect inboxes, threads, delivery activity, and settings.
Does each agent get a real email address?
Yes. You can create dedicated mailboxes for individual agents or workflows. The free plan currently includes two mailboxes, with larger limits on paid plans.
How does an agent receive a message?
Reverbin stores the message in its thread and sends a signed webhook event to your endpoint. Your runtime can verify the signature, process the content, and reply through the API.
Can a human see what the agent sent?
Yes. The operator-facing mail console keeps inbox, sent, thread, and delivery context visible. Policy and approval mechanisms can also place a human in the loop before a sensitive send.
What happens when a webhook fails?
Webhook delivery attempts are recorded so operators can inspect status, attempts, and errors. Agent runtimes should also use idempotency and safe retry behavior.
Can I start without a credit card?
Yes. The Free plan includes two mailboxes, 2,000 emails per month, and one webhook endpoint. You can upgrade later from Billing.
Open the channel
Give your agent a real address.
Start free, connect one webhook, and put your first agent into a conversation.