# MailWebhook
> Deterministic inbound email extraction for developers. Connect real or hosted mailboxes, route incoming messages, transform email content, and deliver signed JSON webhooks.
## Start here
- [Product overview](https://www.mailwebhook.com/)
- [First webhook quickstart](https://docs.mailwebhook.com/docs/quickstart/first-webhook/)
- [API reference](https://docs.mailwebhook.com/api-reference/)
- [OpenAPI 3.1 document](https://docs.mailwebhook.com/assets/json/public-openapi.v1.json)
## Core capabilities
- [Webhook payload reference](https://docs.mailwebhook.com/docs/payloads/webhook-payload-reference/)
- [Webhook signatures](https://docs.mailwebhook.com/docs/delivery/signatures/)
- [Retries and replay](https://docs.mailwebhook.com/docs/delivery/retries-and-replay/)
- [API keys and attachments](https://docs.mailwebhook.com/docs/api/api-keys-and-attachments/)
- [Custom JSON DSL](https://docs.mailwebhook.com/docs/routes/pipeline/custom_json/dsl/)