Mailboxlayer Check API

openapi: 3.2.0
info:
  title: Mailboxlayer Check API
  version: 1.0.0
  description: 'Mailboxlayer offers a simple REST-based JSON API enabling you to thoroughly check and verify email addresses right at the point of entry into your system.


    In addition to checking the syntax, the actual existence of an email address using MX-Records and the Simple Mail Transfer Protocol (SMTP), and detecting whether or not the requested mailbox is configured to catch all incoming mail traffic, the mailboxlayer API is linked to a number of regularly updated databases containing all available email providers, which simplifies the separation of disposable (e.g. "mailinator") and free email addresses (e.g. "gmail", "yahoo") from individual domains.


    Combined with typo checks, did-you-mean suggestions and a numeric score reflecting the quality of each email address, these structures will make it simple to automatically filter "real" customers from abusers and increase response and success rates of your email campaigns.'
servers:
- url: https://apilayer.net/api
security:
- AccessKeyQuery: []
tags:
- name: Check
paths:
  /check:
    get:
      summary: Validate
      description: Perform an email validation for a single email address.
      operationId: checkEmail
      parameters:
      - $ref: '#/components/parameters/access_key'
      - $ref: '#/components/parameters/email'
      - $ref: '#/components/parameters/smtp'
      - $ref: '#/components/parameters/catch_all'
      - $ref: '#/components/parameters/format'
      - $ref: '#/components/parameters/callback'
      responses:
        '200':
          description: Successful validation result (single object). Service-level errors (empty/invalid `email`, plan restrictions) are also returned here with HTTP 200 and a `success:false` ApiError body.
          content:
            application/json:
              schema:
                oneOf:
                - $ref: '#/components/schemas/EmailValidationResponse'
                - $ref: '#/components/schemas/ApiError'
              examples:
                default:
                  value:
                    email: support@mailboxlayer.com
                    did_you_mean: ''
                    user: support
                    domain: mailboxlayer.com
                    format_valid: true
                    mx_found: true
                    smtp_check: true
                    catch_all: false
                    role: false
                    disposable: false
                    free: false
                    score: 0.92
                service_error:
                  value:
                    success: false
                    error:
                      code: 210
                      type: no_email_address_supplied
                      info: 'Please specify an email address. [Example: support@mailboxlayer.com]'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '403':
          $ref: '#/components/responses/Forbidden'
        '404':
          $ref: '#/components/responses/NotFound'
        '422':
          $ref: '#/components/responses/ValidationError'
        '429':
          $ref: '#/components/responses/RateLimitReached'
        '500':
          $ref: '#/components/responses/InternalError'
        '503':
          $ref: '#/components/responses/Maintenance'
      tags:
      - Check
components:
  responses:
    Forbidden:
      description: Forbidden
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            https_access_restricted:
              summary: https_access_restricted
              value:
                success: false
                error:
                  code: 105
                  type: https_access_restricted
                  info: Access Restricted - Your current Subscription Plan does not support HTTPS Encryption.
            function_access_restricted:
              summary: function_access_restricted
              value:
                success: false
                error:
                  code: 105
                  type: function_access_restricted
                  info: Access Restricted - Your current Subscription Plan does not support this API Function.
            api_access_blocked:
              summary: api_access_blocked
              value:
                success: false
                error:
                  code: 104
                  type: api_access_blocked
                  info: Your API access has been temporarily disabled. Please upgrade your Subscription Plan or contact support.
    Maintenance:
      description: Service Unavailable
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            maintenance_mode:
              summary: maintenance_mode
              value:
                success: false
                error:
                  code: 503
                  type: maintenance_mode
                  info: ''
    Unauthorized:
      description: Unauthorized
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            account_on_hold:
              summary: account_on_hold
              value:
                success: false
                error:
                  code: 107
                  type: account_on_hold
                  info: 'Your account currently has open invoices and API has been automatically disabled. Please settle your open balance or downgrade to the Free Plan to restore API access. [Support: support@apilayer.com]'
            invalid_access_key:
              summary: invalid_access_key
              value:
                success: false
                error:
                  code: 101
                  type: invalid_access_key
                  info: 'You have not supplied a valid API Access Key. [Technical Support: support@apilayer.com]'
            missing_access_key:
              summary: missing_access_key
              value:
                success: false
                error:
                  code: 101
                  type: missing_access_key
                  info: 'You have not supplied an API Access Key. [Required format: access_key=YOUR_ACCESS_KEY]'
            inactive_user:
              summary: inactive_user
              value:
                success: false
                error:
                  code: 102
                  type: inactive_user
                  info: Permission denied - User not active.
    NotFound:
      description: Not Found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            invalid_api_function:
              summary: invalid_api_function
              value:
                success: false
                error:
                  code: 103
                  type: invalid_api_function
                  info: This API Function does not exist.
            404_not_found:
              summary: 404_not_found
              value:
                success: false
                error:
                  code: 404
                  type: 404_not_found
                  info: 404 - The requested resource could not be found. Please try again or contact support.
    RateLimitReached:
      description: Too Many Requests
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            usage_limit_reached:
              summary: usage_limit_reached
              value:
                success: false
                error:
                  code: 104
                  type: usage_limit_reached
                  info: Your monthly usage limit has been reached. Please upgrade your Subscription Plan.
            daily_usage_limit_reached:
              summary: daily_usage_limit_reached
              value:
                success: false
                error:
                  code: 104
                  type: daily_usage_limit_reached
                  info: Your daily usage limit has been reached. Please try again tomorrow or upgrade your subscription plan.
            fair_use_limit_reached:
              summary: fair_use_limit_reached
              value:
                success: false
                error:
                  code: 104
                  type: fair_use_limit_reached
                  info: 'Your fair use limit has been reached. [Please contact support: support@apilayer.com]'
            rate_limit_reached:
              summary: rate_limit_reached
              value:
                success: false
                error:
                  code: 106
                  type: rate_limit_reached
                  info: 'You have exceeded the maximum rate limitation allowed on your subscription plan. Please refer to the "Rate Limits" section of the API Documentation for details. '
    ValidationError:
      description: Request-validation error — a required query parameter is missing or malformed (for example no `email` supplied). Returned with HTTP 422 and FastAPI's validation body.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/RequestValidationError'
          examples:
            missing_email:
              value:
                detail:
                - loc:
                  - query
                  - email
                  msg: field required
                  type: value_error.missing
    InternalError:
      description: Internal Server Error
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ApiError'
          examples:
            internal_error:
              summary: internal_error
              value:
                success: false
                error:
                  code: 0
                  type: internal_error
                  info: 'An error has occured. [Technical Support: support@apilayer.com]'
  parameters:
    access_key:
      name: access_key
      in: query
      required: true
      schema:
        type: string
      description: Mailboxlayer API Access Key (required for all requests).
      example: YOUR_ACCESS_KEY
    catch_all:
      name: catch_all
      in: query
      required: false
      schema:
        type: integer
        enum:
        - 0
        - 1
      description: Enable catch-all mailbox detection by setting `catch_all=1`. Disabled by default because check is heavier and may increase response time. If not requested, the `catch_all` response value will typically be `null`. Some plans restrict catch-all detection.
      example: 0
    callback:
      name: callback
      in: query
      required: false
      schema:
        type: string
      description: JSONP callback function name; wrapper will be returned if specified.
      example: myCallback
    format:
      name: format
      in: query
      required: false
      schema:
        type: integer
        enum:
        - 0
        - 1
      description: Set to 1 for human-prettified JSON output (useful for debugging; increases payload size).
      example: 0
    email:
      name: email
      in: query
      required: true
      schema:
        type: string
        format: email
      description: Email address to validate (single validation).
      example: support@mailboxlayer.com
    smtp:
      name: smtp
      in: query
      required: false
      schema:
        type: integer
        enum:
        - 0
        - 1
      description: Enable (1) or disable (0) the SMTP check. SMTP verification is active by default. Turning it off may speed up responses but disables the `smtp_check` verdict.
      example: 1
  schemas:
    ApiError:
      type: object
      description: Standard error payload returned by Mailboxlayer when a request fails.
      properties:
        success:
          type: boolean
          description: Always false for error responses.
          example: false
        error:
          type: object
          properties:
            code:
              type: integer
              description: Numeric error code as defined in Mailboxlayer docs.
              example: 210
            type:
              type: string
              description: Short machine-readable error type.
              example: no_email_address_supplied
            info:
              type: string
              description: Human-readable info / suggestion for correcting the request.
              example: 'Please specify an email address. [Example: support@mailboxlayer.com]'
          required:
          - code
          - type
          - info
      required:
      - success
      - error
    RequestValidationError:
      type: object
      description: FastAPI request-validation error body. Returned with HTTP 422 when a required query parameter is missing or malformed. This is a different shape from the ApiError envelope used for service-level errors (which are returned with HTTP 200).
      properties:
        detail:
          type: array
          items:
            type: object
            properties:
              loc:
                type: array
                items:
                  type: string
                example:
                - query
                - email
              msg:
                type: string
                example: field required
              type:
                type: string
                example: value_error.missing
    EmailValidationResponse:
      type: object
      description: A single email validation result object. Fields may be `true`/`false` or `null` depending on whether a check was performed or supported by your plan.
      properties:
        email:
          type: string
          format: email
          description: Exact email address as checked.
          example: support@mailboxlayer.com
        did_you_mean:
          type:
          - string
          - 'null'
          description: Suggested correction if a domain-typo is detected; empty string if none.
          example: ''
        user:
          type:
          - string
          - 'null'
          description: Local part (before the @) of the email address.
          example: support
        domain:
          type:
          - string
          - 'null'
          description: Domain part (after the @) of the email address.
          example: mailboxlayer.com
        format_valid:
          type:
          - boolean
          - 'null'
          description: Returns true if the email address syntax is valid per RFC rules.
          example: true
        mx_found:
          type:
          - boolean
          - 'null'
          description: True if MX records for the domain were found.
          example: true
        smtp_check:
          type:
          - boolean
          - 'null'
          description: Result of SMTP verification (true = mailbox appears to exist).
          example: true
        catch_all:
          type:
          - boolean
          - 'null'
          description: True if the domain accepts all emails (catch-all). If catch-all detection was not requested or not permitted on plan, this value may be null.
          example: false
        role:
          type:
          - boolean
          - 'null'
          description: True if the email address is a role account (e.g., admin, support).
          example: false
        disposable:
          type:
          - boolean
          - 'null'
          description: True if the address belongs to a known disposable / temporary provider.
          example: false
        free:
          type:
          - boolean
          - 'null'
          description: True if the email uses a known free provider (e.g., gmail.com).
          example: true
        score:
          type:
          - number
          - 'null'
          format: double
          description: Aggregate quality/deliverability score between 0 (worst) and 1 (best).
          example: 0.92
      required:
      - email
  securitySchemes:
    AccessKeyQuery:
      type: apiKey
      in: query
      name: access_key
      description: Your Mailboxlayer API access key; pass as `access_key` query parameter.
externalDocs:
  description: Official Mailboxlayer documentation (reference)
  url: https://mailboxlayer.com/documentation