# Retrieve a specific block

## API Overview

[Blocks](/docs/sendgrid/glossary/blocks/) happen when your email is rejected because of an issue with the message itself rather than an issue with the recipient's address.

There are several causes for blocked emails. For example, your mail server IP address may be blocked by an ISP, or the receiving server may flag the message content using a filter. Twilio SendGrid will not suppress future messages to blocked addresses by default.

For more information, please see our [Blocks documentation](/docs/sendgrid/ui/sending-email/blocks/).

You can also see your Blocks in the [Suppressions settings menu of the Twilio SendGrid App](https://app.sendgrid.com/suppressions/blocks).

## Operation overview

```json
{"path":"https://api.sendgrid.com/v3/suppression/blocks/{email}","method":"get","servers":[{"url":"https://api.sendgrid.com","description":"for global users and subusers"},{"url":"https://api.eu.sendgrid.com","description":"for EU regional subusers"}]}
```

**This endpoint allows you to retrieve a specific email address from your blocks list.**

## Operation details

### Authentication

API Key

### Headers

```json
[{"in":"header","name":"Authorization","required":true,"default":"Bearer <<YOUR_API_KEY_HERE>>","schema":{"type":"string"}},{"name":"on-behalf-of","in":"header","description":"The `on-behalf-of` header allows you to make API calls from a parent account on behalf of the parent's Subusers or customer accounts. You will use the parent account's API key when using this header. When making a call on behalf of a customer account, the property value should be \"account-id\" followed by the customer account's ID (e.g., `on-behalf-of: account-id <account-id>`). When making a call on behalf of a Subuser, the property value should be the Subuser's username (e.g., `on-behalf-of: <subuser-username>`). It is important to use the Base URL that corresponds to the region of the account or Subuser you specify in the `on-behalf-of` header. See [**On Behalf Of**](/docs/sendgrid/api-reference/how-to-use-the-sendgrid-v3-api/on-behalf-of) for more information.","required":false,"schema":{"type":"string"},"refName":"#/components/parameters/OnBehalfOf","modelName":"__components_parameters_OnBehalfOf"}]
```

### Path parameters

```json
[{"name":"email","in":"path","description":"The email address of the specific block.","required":true,"schema":{"type":"string","format":"email"}}]
```

### Responses

```json
[{"responseCode":"200","schema":{"description":"","content":{"application/json":{"schema":{"title":"Blocks Response","type":"array","example":[{"created":1443651154,"email":"example@example.com","reason":"error dialing remote address: dial tcp 10.57.152.165:25: no route to host","status":"4.0.0"}],"refName":"BlocksResponse","modelName":"BlocksResponse","items":{"type":"object","required":["created","email","reason","status"],"properties":{"created":{"type":"integer","description":"A Unix timestamp indicating when the email address was added to the blocks list."},"email":{"type":"string","description":"The email address that was added to the block list.","format":"email"},"reason":{"type":"string","description":"An explanation for the reason of the block."},"status":{"type":"string","description":"The status of the block."}}}},"examples":{"response":{"value":[{"created":1443651154,"email":"example@example.com","reason":"error dialing remote address: dial tcp 10.57.152.165:25: no route to host","status":"4.0.0"}]}}}}}}]
```

Retrieve a specific block

```js
const client = require("@sendgrid/client");
client.setApiKey(process.env.SENDGRID_API_KEY);

const email = "brian12@example.net";

const request = {
  url: `/v3/suppression/blocks/${email}`,
  method: "GET",
};

client
  .request(request)
  .then(([response, body]) => {
    console.log(response.statusCode);
    console.log(response.body);
  })
  .catch((error) => {
    console.error(error);
  });
```

```python
import os
from sendgrid import SendGridAPIClient


sg = SendGridAPIClient(os.environ.get("SENDGRID_API_KEY"))

email = "brian12@example.net"

response = sg.client.suppression.blocks._(email).get()

print(response.status_code)
print(response.body)
print(response.headers)
```

```csharp
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using SendGrid;

public class Program {
    public static async Task Main() {
        string apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");
        var client = new SendGridClient(apiKey);

        var email = "brian12@example.net";

        var response = await client.RequestAsync(
            method: SendGridClient.Method.GET, urlPath: $"suppression/blocks/{email}");

        Console.WriteLine(response.StatusCode);
        Console.WriteLine(response.Body.ReadAsStringAsync().Result);
        Console.WriteLine(response.Headers.ToString());
    }
}
```

```java
import com.sendgrid.*;
import java.io.IOException;

public class Example {
    public static void main(String[] args) throws IOException {
        try {
            SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
            Request request = new Request();
            request.setMethod(Method.GET);
            request.setEndpoint("/suppression/blocks/brian12@example.net");
            Response response = sg.api(request);
            System.out.println(response.getStatusCode());
            System.out.println(response.getBody());
            System.out.println(response.getHeaders());
        } catch (IOException ex) {
            throw ex;
        }
    }
}
```

```go
package main

import (
	"fmt"
	"github.com/sendgrid/sendgrid-go"
	"os"
)

func main() {
	apiKey := os.Getenv("SENDGRID_API_KEY")
	host := "https://api.sendgrid.com"
	request := sendgrid.GetRequest(apiKey, "/v3/suppression/blocks/brian12@example.net", host)
	request.Method = "GET"
	response, err := sendgrid.API(request)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	} else {
		fmt.Println(response.StatusCode)
		fmt.Println(response.Body)
		fmt.Println(response.Headers)
	}
}
```

```php
<?php
// Uncomment the next line if you're using a dependency loader (such as Composer) (recommended)
// require 'vendor/autoload.php';

// Uncomment next line if you're not using a dependency loader (such as Composer)
// require_once '<PATH TO>/sendgrid-php.php';

$apiKey = getenv("SENDGRID_API_KEY");
$sg = new \SendGrid($apiKey);
$email = "brian12@example.net";

try {
    $response = $sg->client
        ->suppression()
        ->blocks()
        ->_($email)
        ->get();
    print $response->statusCode() . "\n";
    print_r($response->headers());
    print $response->body() . "\n";
} catch (Exception $ex) {
    echo "Caught exception: " . $ex->getMessage();
}
```

```ruby
require 'sendgrid-ruby'
include SendGrid

sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'])
email = "brian12@example.net"

response = sg.client.suppression.blocks._(email).get()
puts response.status_code
puts response.headers
puts response.body
```

```bash
curl -X GET "https://api.sendgrid.com/v3/suppression/blocks/brian12%40example.net" \
--header "Authorization: Bearer $SENDGRID_API_KEY"
```