Email to Webhook: Inbound Email as HTTP Requests
Get an email address that turns every inbound email into a structured webhook. Text, HTML, headers, and attachments parsed to JSON and forwarded to any URL — no mail server, no IMAP polling, no parsing infrastructure.
Published June 10, 2026 · Part of the Hooklistener webhook inbox.
Why turn email into webhooks?
Email is the protocol nobody plans around but everybody depends on. Your app sends signup confirmations and password resets that you can only verify by hand. Vendors send nightly CSV reports to a shared mailbox someone checks “when they remember”. A monitoring appliance from 2014 can alert you by email and nothing else.
The traditional fix is grim: run a mail server or rent a mailbox, poll IMAP on a cron job, parse MIME by hand, and hope multipart boundaries and encodings behave. That is a lot of infrastructure for what you actually want — an HTTP request with a JSON body every time an email arrives.
Hooklistener gives you exactly that. Create a unique @hookinbox.com address, and every email sent to it becomes an inspectable event with the text body, HTML body, headers, and attachments already parsed. Forward it to any endpoint and your handler treats email like it treats a Stripe or GitHub webhook: a POST request with structured data.
What you get with email inboxes
Unique @hookinbox.com addresses
Create as many email inboxes as you need, each with its own address like ci-signups@hookinbox.com. Every email sent to that address is captured as an inspectable event.
Full email parsing
Each inbound email is parsed into a structured payload: sender, recipients, subject, plain-text body, HTML body, and headers. No MIME parsing code on your side.
Email-to-HTTP forwarding
Route inbound email to any URL as a structured webhook payload. Your endpoint receives a normal HTTP POST with JSON — the same way it receives any other webhook.
Attachment capture
Attachments arrive alongside the parsed email so you can inspect and process PDFs, CSV reports, and images instead of letting them rot in a shared mailbox.
Inspect before you integrate
Open any captured email in the dashboard and see exactly what your handler will receive. Copy the real payload shape into your code instead of guessing.
MCP tools for AI agents
Drive inboxes from Claude Code, Cursor, or any MCP client: create_inbox, list_inboxes, list_emails, get_email, and wait_for_email for end-to-end test automation.
How email to webhook works
Create an inbox
Create an email inbox in the dashboard (or via the create_inbox MCP tool) and get a unique address like you@hookinbox.com. No DNS records, no mail server setup.
Send email to the address
Point your app, CI suite, appliance, or vendor at the address. Anything that can send email can now reach your system — SMTP is the only requirement on their side.
Inspect the parsed payload
Each email appears as an event with the plain-text body, HTML body, headers, and attachments already parsed. Open it in the dashboard exactly like a captured webhook.
Forward as JSON to any endpoint
Configure forwarding and every inbound email is delivered to your URL as a structured HTTP POST. From your handler it looks like any other webhook.
The forwarded payload is plain JSON, so the receiving side is just a normal HTTP handler. A trimmed example of what your endpoint sees:
POST https://my-project.hook.events/email-events
{
"from": "reports@vendor.example",
"to": ["invoices@hookinbox.com"],
"subject": "Daily settlement report",
"text": "Attached is the settlement report for June 10...",
"html": "<p>Attached is the settlement report...</p>",
"attachments": [
{ "filename": "settlement-2026-06-10.csv", "contentType": "text/csv" }
]
}What developers build with it
Transactional email testing in CI
Create an inbox per test run, register signup-confirm-42@hookinbox.com as the user email, trigger the flow, and assert on the parsed email. wait_for_email blocks until the message lands — no polling loops, no flaky sleeps.
Password reset and magic-link flows
Verify the reset email actually goes out, extract the link from the parsed HTML body, and follow it in the same test. The whole loop runs against a real inbound mailbox.
Support and notification routing
Pipe alerts@hookinbox.com into your internal tools. Forward each email as JSON to a Slack bridge, a ticketing API, or your own service — no shared mailbox scraping.
Legacy email-only integrations
Plenty of appliances, scanners, and vendor systems only speak email: nightly reports, hardware alerts, EDI-ish CSV exports. Point them at an inbox and treat every message as an API call.
Attachment processing pipelines
Receive vendor invoices or data exports by email, capture the attachments, and forward the event to the service that parses them. The email address becomes your upload endpoint.
AI-driven test automation
Let a coding agent create an inbox, run your signup flow, and call wait_for_email to verify the confirmation arrived — all through the MCP server, without leaving the editor.
Automate email assertions with MCP
Testing email flows is usually the flakiest part of an end-to-end suite: trigger the signup, then sleep, poll, sleep again, and hope the message arrived. The Hooklistener MCP server exposes email inboxes as tools, so both your CI scripts and AI coding agents can drive the whole loop deterministically.
create_inbox— spin up a fresh @hookinbox.com address per test runlist_inboxes— enumerate the inboxes in your workspacelist_emails— list captured emails for an inboxget_email— fetch one parsed email: text, HTML, headers, attachmentswait_for_email— block for up to 60 seconds until a matching email arrives
With wait_for_email, an agent can create an inbox, run your password-reset flow, wait for the message, extract the reset link from the HTML body, and verify the page it leads to — one tool call per step, no sleeps. See the MCP guide for AI coding assistants for setup with Claude Code, Cursor, and Windsurf.
When you should use a full inbound-email service instead
Hooklistener email inboxes are built for one job: receiving email and turning it into structured events and webhooks. They are deliberately not a general-purpose email platform. Reach for a dedicated service like SendGrid Inbound Parse, Postmark, or Mailgun when you need to:
- Send email. Inboxes are receive-only — transactional sending, deliverability tuning, and bounce handling belong to a sending provider.
- Receive mail on your own domain at scale, with MX records, SPF, and DKIM under your control.
- Apply complex routing rules at the mail-server level — per-recipient policies, quarantine, spam scoring thresholds, mailing-list semantics.
- Host long-lived human mailboxes that people read and reply from.
The two compose well: many teams send through a provider and use Hooklistener to test the receiving side, or to debug the SendGrid event webhooks their provider emits. If your need is “email in, JSON out, with full inspection” — that is exactly what this is for.
Email is one source — the inbox handles them all
Email inboxes live alongside your HTTP endpoints in the webhook inbox, so email events and webhook events share the same inspection, search, and forwarding workflow. Send test requests with the webhook tester, step through failures in the webhook debugger, or forward events straight to localhost with the CLI tunnel.
Email inboxes are part of the platform — check pricing for plan details and the changelog for what shipped recently.
Frequently asked questions
How does email to webhook work?
You create an inbox and get a unique @hookinbox.com email address. Hooklistener receives mail for that address, parses each message into structured data (sender, subject, text body, HTML body, headers, attachments), stores it as an inspectable event, and can forward it to any URL you configure as an HTTP POST with a JSON payload.
What does the webhook payload contain?
The forwarded payload includes the envelope details (from, to, subject), the plain-text and HTML bodies, the message headers, and any attachments. You consume it like any other webhook — no MIME parsing or IMAP client in your codebase.
Do I need to run a mail server or poll IMAP?
No. Hooklistener handles mail receiving and parsing for you. There is no mail server to operate, no MX records to configure for your own domain, and no IMAP polling loop to maintain. You create an address and start receiving structured events.
Can I use this to test transactional emails in CI?
Yes — that is one of the main use cases. Create an inbox per test run, use the address as the test user's email, trigger your signup or password-reset flow, and assert on the parsed message. The wait_for_email MCP tool blocks for up to 60 seconds until a matching email arrives, which removes polling and sleep-based flakiness from your tests.
Can I send email from a hookinbox.com address?
No. Inboxes are receive-only: they turn inbound email into events and webhooks. If you need to send email, or you need complex routing rules enforced at the mail-server level, use a full email service alongside Hooklistener.
Is there a free way to try it?
Yes. Hooklistener has a free plan, so you can create an inbox, send yourself an email, and inspect the parsed payload before deciding anything. See the pricing page for plan details.
Get your first email inbox in under a minute
Create an @hookinbox.com address, send yourself an email, and watch it arrive as a parsed, forwardable event. No mail server, no MX records, no MIME parsing.