Create a sending domain restriction

POST/accounts/{account_id}/email-security/settings/sending_domain_restrictions

Creates a new sending domain restriction to enforce TLS requirements for a domain. Emails without TLS from this domain will be dropped unless the subdomain is in the exclude list.

Security

API Token

The preferred authorization scheme for interacting with the Cloudflare API. Create a token.

Example:Authorization: Bearer Sn3lZJTBX6kkg7OdcBUAxOO963GEIyGQqnFTOFYY

API Email + API Key

The previous authorization scheme for interacting with the Cloudflare API, used in conjunction with a Global API key.

Example:X-Auth-Email: user@example.com

The previous authorization scheme for interacting with the Cloudflare API. When possible, use API tokens instead of Global API keys.

Example:X-Auth-Key: 144c9defac04969c7bfad8efaa8ea194

Accepted Permissions (at least one required)

Cloud Email Security: Write

Path ParametersExpand Collapse

account_id: string

Identifier.

maxLength32

Body ParametersJSONExpand Collapse

domain: string

Domain that requires TLS enforcement.

exclude: array of string

Excluded subdomains that are exempt from TLS requirements.

comments: optional string

maxLength1024

ReturnsExpand Collapse

errors: array of object { code, message, documentation_url, source }

code: number

minimum1000

message: string

documentation_url: optional string

source: optional object { pointer }

pointer: optional string

messages: array of object { code, message, documentation_url, source }

code: number

minimum1000

message: string

documentation_url: optional string

source: optional object { pointer }

pointer: optional string

success: true

Whether the API call was successful.

result: optional object { id, comments, created_at, 4 more }

A sending domain restriction that enforces TLS (Transport Layer Security) requirements for emails from specific domains. If TLS is required, mail without TLS from the specified domain will be dropped.

id: optional string

Sending domain restriction identifier.

formatuuid

comments: optional string

maxLength1024

created_at: optional string

formatdate-time

domain: optional string

Domain that requires TLS enforcement.

exclude: optional array of string

Excluded subdomains that are exempt from TLS requirements.

Deprecatedlast_modified: optional string

Deprecated, use modified_at instead. End of life: November 1, 2026.

formatdate-time

modified_at: optional string

formatdate-time

Create a sending domain restriction

curl https://api.cloudflare.com/client/v4/accounts/$ACCOUNT_ID/email-security/settings/sending_domain_restrictions \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $CLOUDFLARE_API_TOKEN" \
    -d '{
          "domain": "example.com",
          "exclude": [
            "subdomain.example.com"
          ],
          "comments": "Enforce TLS for all mail from this domain"
        }'

{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": {
    "id": "f174e90a-fafe-4643-bbbc-4a0ed4fc8415",
    "comments": "Enforce TLS for all mail from this domain",
    "created_at": "2014-01-01T05:20:00.12345Z",
    "domain": "example.com",
    "exclude": [
      "subdomain.example.com"
    ],
    "last_modified": "2014-01-01T05:20:00.12345Z",
    "modified_at": "2014-01-01T05:20:00.12345Z"
  }
}

Returns Examples

{
  "errors": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "messages": [
    {
      "code": 1000,
      "message": "message",
      "documentation_url": "documentation_url",
      "source": {
        "pointer": "pointer"
      }
    }
  ],
  "success": true,
  "result": {
    "id": "f174e90a-fafe-4643-bbbc-4a0ed4fc8415",
    "comments": "Enforce TLS for all mail from this domain",
    "created_at": "2014-01-01T05:20:00.12345Z",
    "domain": "example.com",
    "exclude": [
      "subdomain.example.com"
    ],
    "last_modified": "2014-01-01T05:20:00.12345Z",
    "modified_at": "2014-01-01T05:20:00.12345Z"
  }
}