---
title: Configure send bindings
description: Restrict which senders and recipients a Workers send_email binding can use with Email Service.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# Configure send bindings

When you add a `send_email` binding to a Worker, you can restrict which addresses it may send from and to. Configure these restrictions in your Wrangler configuration file. For the binding API itself, refer to the [Workers API](https://edgetunnel-b2h.pages.dev/email-service/api/send-emails/workers-api/).

## Binding types

Each entry in `send_email` can be configured to restrict what the binding can do. The sender address must always belong to a domain you have onboarded to Email Service.

* **No restriction attribute**: The binding can send to any verified destination address in your account.
* **`destination_address`**: The binding can only send to the single destination address configured here. If you call `send()` with `to` set to `null` or `undefined`, the configured address is used.
* **`allowed_destination_addresses`**: The binding can only send to addresses listed in this allowlist.
* **`allowed_sender_addresses`**: The binding can only send from the addresses listed in this allowlist.

* [  wrangler.jsonc ](#tab-panel-9225)
* [  wrangler.toml ](#tab-panel-9226)

**JSONC**

```jsonc
{
  "send_email": [
    // Send to any verified destination
    { "name": "EMAIL" },
    // Send only to a single fixed destination
    {
      "name": "NOTIFY_OPS",
      "destination_address": "ops@yourdomain.com",
    },
    // Send only to addresses on an allowlist
    {
      "name": "EMAIL_TEAM",
      "allowed_destination_addresses": [
        "alice@yourdomain.com",
        "bob@yourdomain.com",
      ],
    },
    // Send only from addresses on an allowlist
    {
      "name": "RESTRICTED_EMAIL",
      "allowed_sender_addresses": [
        "noreply@yourdomain.com",
        "support@yourdomain.com",
      ],
    },
  ],
}
```

**TOML**

```toml
[[send_email]]
name = "EMAIL"


[[send_email]]
name = "NOTIFY_OPS"
destination_address = "ops@yourdomain.com"


[[send_email]]
name = "EMAIL_TEAM"
allowed_destination_addresses = [ "alice@yourdomain.com", "bob@yourdomain.com" ]


[[send_email]]
name = "RESTRICTED_EMAIL"
allowed_sender_addresses = [ "noreply@yourdomain.com", "support@yourdomain.com" ]
```

## Next steps

* [Workers API](https://edgetunnel-b2h.pages.dev/email-service/api/send-emails/workers-api/) — send emails from a Worker using the binding.
* [Domain configuration](https://edgetunnel-b2h.pages.dev/email-service/configuration/domains/) — onboard the domains you send from.

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```