documentation/content/en/methods/admin/canonical_email_blocks.md

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---
title: canonical_email_blocks API methods
description: Block certain email addresses by their hash.
menu:
docs:
name: canonical_email_blocks
parent: methods-admin
identifier: methods-admin-canonical_email_blocks
aliases: [
"/methods/admin/canonical_email_blocks",
"/api/methods/admin/canonical_email_blocks",
]
---
<style>
#TableOfContents ul ul ul {display: none}
</style>
## List all canonical email blocks {#get}
```http
GET /api/v1/admin/canonical_email_blocks HTTP/1.1
```
**Returns:** Array of [Admin::CanonicalEmailBlock]({{< relref "entities/Admin_CanonicalEmailBlock" >}})\
**OAuth:** User token + `admin:read:canonical_email_blocks`\
**Permissions:** Manage Blocks\
**Version history:**\
4.0.0 - added
#### Request
##### Headers
Authorization
: {{<required>}} Provide this header with `Bearer <user token>` to gain authorized access to this API method.
##### Query parameters
max_id
: **Internal parameter.** Use HTTP `Link` header for pagination.
since_id
: **Internal parameter.** Use HTTP `Link` header for pagination.
min_id
: **Internal parameter.** Use HTTP `Link` header for pagination.
limit
: Integer. Maximum number of results to return. Defaults to 100 blocks. Max 200 blocks.
#### Response
##### 200: OK
```json
[
{
"id": "1",
"canonical_email_hash": "b344e55d11b3fc25d0d53194e0475838bf17e9be67ce3e6469956222d9a34f9c"
},
// ...
]
```
Because CanonicalEmailBlock IDs are generally not exposed via any API responses, you will have to parse the HTTP `Link` header to load older or newer results. See [Paginating through API responses]({{<relref "api/guidelines#pagination">}}) for more information.
```http
Link: <http://mastodon.example/api/v1/admin/canonical_email_blocks?limit=2&max_id=2>; rel="next", <http://mastodon.example/api/v1/admin/canonical_email_blocks?limit=2&since_id=1>; rel="prev"
```
##### 403: Forbidden
Authorized user is missing a permission, or invalid or missing Authorization header
```json
{
"error": "This action is not allowed"
}
```
---
## Show a single canonical email block {#get-one}
```http
GET /api/v1/admin/canonical_email_blocks/:id HTTP/1.1
```
**Returns:** [Admin::CanonicalEmailBlock]({{< relref "entities/Admin_CanonicalEmailBlock" >}})\
**OAuth:** User token + `admin:read:canonical_email_blocks`\
**Permissions:** Manage Blocks\
**Version history:**\
4.0.0 - added
#### Request
##### Path parameters
:id
: {{<required>}} String. The ID of the Admin::CanonicalEmailBlock in the database.
##### Headers
Authorization
: {{<required>}} Provide this header with `Bearer <user token>` to gain authorized access to this API method.
#### Response
##### 200: OK
```json
{
"id": "1",
"canonical_email_hash": "b344e55d11b3fc25d0d53194e0475838bf17e9be67ce3e6469956222d9a34f9c"
}
```
##### 403: Forbidden
Authorized user is missing a permission, or invalid or missing Authorization header
```json
{
"error": "This action is not allowed"
}
```
##### 404: Not found
Canonical email block does not exist or was already deleted
```json
{
"error": "Record not found"
}
```
---
## Test {#test}
```http
POST /api/v1/admin/canonical_email_blocks/test HTTP/1.1
```
Canoniocalize and hash an email address.
**Returns:** Array of [Admin::CanonicalEmailBlock]({{< relref "entities/Admin_CanonicalEmailBlock" >}})\
**OAuth:** User token + `admin:read:canonical_email_blocks`\
**Permissions:** Manage Blocks\
**Version history:**\
4.0.0 - added
#### Request
##### Headers
Authorization
: {{<required>}} Provide this header with `Bearer <user token>` to gain authorized access to this API method.
##### Form data parameters
email
: {{<required>}} String. The email to canonicalize and hash.
#### Response
##### 200: OK
All matching canonical email blocks are returned.
```json
[
{
"id": "1",
"canonical_email_hash": "b344e55d11b3fc25d0d53194e0475838bf17e9be67ce3e6469956222d9a34f9c"
}
]
```
##### 403: Forbidden
Authorized user is missing a permission, or invalid or missing Authorization header
```json
{
"error": "This action is not allowed"
}
```
##### 500: Server error
<!-- TODO: remove when https://github.com/mastodon/mastodon/issues/21774 is fixed -->
No email was provided
---
## Block a canonical email {#create}
```http
POST /api/v1/admin/canonical_email_blocks HTTP/1.1
```
**Returns:** [Admin::CanonicalEmailBlock]({{< relref "entities/Admin_CanonicalEmailBlock" >}})\
**OAuth:** User token + `admin:write:canonical_email_blocks`\
**Permissions:** Manage Blocks\
**Version history:**\
4.0.0 - added
#### Request
##### Headers
Authorization
: {{<required>}} Provide this header with `Bearer <user token>` to gain authorized access to this API method.
##### Form data parameters
email
: {{<required>}} String. The email to canonicalize, hash, and block. If this parameter is provided, `canonical_email_hash` will be ignored.
canonical_email_hash
: String. The hash to test against. If `email` is not provided, this parameter is required.
#### Response
##### 200: OK
Canonical email has been successfully blocked
```json
{
"id": "1",
"canonical_email_hash": "b344e55d11b3fc25d0d53194e0475838bf17e9be67ce3e6469956222d9a34f9c"
}
```
##### 403: Forbidden
Authorized user is missing a permission, or invalid or missing Authorization header
```json
{
"error": "This action is not allowed"
}
```
##### 422: Unprocessable entity
Canonical email hash is already blocked
```json
{
"error":"Validation failed: Canonical email hash has already been taken"
}
```
---
## Delete a canonical email block {#delete}
```http
DELETE /api/v1/admin/canonical_email_blocks/:id HTTP/1.1
```
**Returns:** [Admin::CanonicalEmailBlock]({{< relref "entities/Admin_CanonicalEmailBlock" >}})\
**OAuth:** User token + `admin:write:canonical_email_blocks`\
**Permissions:** Manage Blocks\
**Version history:**\
4.0.0 - added
#### Request
##### Path parameters
:id
: {{<required>}} String. The ID of the Admin::CanonicalEmailBlock in the database.
##### Headers
Authorization
: {{<required>}} Provide this header with `Bearer <user token>` to gain authorized access to this API method.
#### Response
##### 200: OK
Canonical email block successfully deleted.
```json
{}
```
##### 403: Forbidden
Authorized user is missing a permission, or invalid or missing Authorization header
```json
{
"error": "This action is not allowed"
}
```
##### 404: Not found
Canonical email block does not exist or was already deleted
```json
{
"error": "Record not found"
}
```
---
## See also
{{< caption-link url="https://github.com/mastodon/mastodon/blob/main/app/controllers/api/v1/admin/canonical_email_blocks_controller.rb" caption="app/controllers/api/v1/admin/canonical_email_blocks_controller.rb" >}}