## Block a handle

**post** `/v3/blocked_handles`

Blocks a handle — an E.164 phone number, an email address (iMessage
sender), an SMS short code (e.g. `262966`), or an alphanumeric sender
ID. Inbound messages from it are dropped and produce no webhooks, and
direct sends to it are rejected with `403` (error code `2026`); group
sends that include unblocked members are not restricted. Blocking is
idempotent — re-blocking an already blocked handle returns the
existing entry.

### Body Parameters

- `handle: string`

  The handle to block: an E.164 phone number, an email address, an
  SMS short code (3-8 digits), or an alphanumeric sender ID.

- `reason: optional string`

  Optional free-text note on why the handle was blocked

### Returns

- `blocked_handle: BlockedHandleEntry`

  - `blocked_at: string`

    When the handle was blocked

  - `handle: string`

    The blocked handle, normalized (E.164 phone, lowercased email, short code, or sender ID)

  - `reason: optional string`

    Optional note recorded when the handle was blocked

### Example

```http
curl https://api.linqapp.com/api/partner/v3/blocked_handles \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $LINQ_API_V3_API_KEY" \
    -d '{
          "handle": "+12025551234",
          "reason": "spam"
        }'
```

#### Response

```json
{
  "blocked_handle": {
    "handle": "+12025551234",
    "reason": "spam",
    "blocked_at": "2026-07-30T16:42:00Z"
  }
}
```