> ## Documentation Index > Fetch the complete documentation index at: https://sendmux.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get domain-wide sender filters > Returns the current sender-filter mode and rule set applied to every mailbox under this domain. Only sending and receiving domains support domain-wide filters. Per-mailbox rules take precedence at match time. Responses carry a weak `ETag` — send it as `If-None-Match` to skip the body when the filter set has not changed (returns `304 Not Modified`). The same ETag is the value to use in `If-Match` on the corresponding PUT for optimistic concurrency. ## OpenAPI ````yaml /openapi-app.json get /domains/{public_id}/filters openapi: 3.1.0 info: description: Programmatic access to your Sendmux email infrastructure. title: Sendmux API version: 1.0.0 servers: - description: API v1 url: https://app.sendmux.ai/api/v1 security: - bearerAuth: [] paths: /domains/{public_id}/filters: get: tags: - Domain Filters summary: Get domain-wide sender filters description: >- Returns the current sender-filter mode and rule set applied to every mailbox under this domain. Only sending and receiving domains support domain-wide filters. Per-mailbox rules take precedence at match time. Responses carry a weak `ETag` — send it as `If-None-Match` to skip the body when the filter set has not changed (returns `304 Not Modified`). The same ETag is the value to use in `If-Match` on the corresponding PUT for optimistic concurrency. operationId: managementGetDomainFilters parameters: - in: path name: public_id required: true schema: description: Domain public ID type: string - in: header name: If-None-Match required: false schema: description: Weak ETag from a previous response. Returns 304 when unchanged. type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/FilterStateResponse' description: Filter state headers: ETag: description: Weak ETag for conditional GETs and optimistic-concurrency PUTs. schema: example: W/"a1b2c3d4e5f60718" type: string '304': description: >- Not Modified — the client's cached copy (matching `If-None-Match`) is still current. headers: ETag: description: Current weak ETag. schema: type: string '404': content: application/json: schema: $ref: '#/components/schemas/ApiError' description: Domain not found '409': content: application/json: schema: $ref: '#/components/schemas/ApiError' description: Domain is send-only and does not support inbound filters. '503': content: application/json: schema: $ref: '#/components/schemas/ApiError' description: Filter service temporarily unavailable security: - bearerAuth: [] components: schemas: FilterStateResponse: allOf: - $ref: '#/components/schemas/SuccessEnvelope' - properties: data: $ref: '#/components/schemas/FilterState' meta: $ref: '#/components/schemas/ResponseMeta' required: - data type: object unevaluatedProperties: false ApiError: additionalProperties: false properties: error: additionalProperties: false properties: code: description: Machine-readable error code enum: - invalid_parameter - missing_parameter - authentication_required - insufficient_permissions - not_found - conflict - limit_exceeded - idempotency_conflict - payload_too_large - validation_error - rate_limit_exceeded - service_unavailable - internal_error example: invalid_parameter type: string doc_url: description: Link to relevant documentation type: string errors: description: >- Accumulated per-field issues for validation errors. Only present on 400/422 responses. items: $ref: '#/components/schemas/ApiErrorDetail' type: array message: description: Human-readable error description type: string param: description: The parameter that caused the error type: string retryable: description: >- Whether the caller may safely retry this request. 4xx are typically false (except 429); 5xx are typically true. example: false type: boolean required: - code - message - retryable type: object meta: additionalProperties: false properties: request_id: example: req_clxxxxxxxxxxxxxxxxxxxxxxxxx type: string required: - request_id type: object ok: enum: - false type: boolean required: - ok - error - meta type: object SuccessEnvelope: properties: meta: additionalProperties: {} properties: {} type: object ok: enum: - true type: boolean required: - ok - meta type: object FilterState: additionalProperties: false properties: mode: description: >- Active filtering mode. `off` disables filtering (all senders accepted). `allowlist` only accepts senders matching a rule. `denylist` blocks senders matching a rule. enum: - 'off' - allowlist - denylist type: string rules: description: Current rules, sorted by pattern ascending items: $ref: '#/components/schemas/FilterRule' type: array required: - mode - rules type: object ResponseMeta: additionalProperties: false properties: request_id: example: req_clxxxxxxxxxxxxxxxxxxxxxxxxx type: string required: - request_id type: object ApiErrorDetail: additionalProperties: false properties: code: description: >- Machine-readable issue code from the validator (e.g. zod issue code). example: invalid_string type: string field: description: Dot-path of the offending request field. example: recipient.email type: string message: description: Human-readable issue description. type: string required: - field - code - message type: object FilterRule: additionalProperties: false properties: note: description: >- Free-form caption for the rule (≤255 chars). UI-only metadata — never consulted at match time. `null` when absent. example: billing webhooks maxLength: 255 type: - string - 'null' pattern: description: >- Email address or bare domain name. Validated against RFC 5321/1035 regexes. The `*@domain` wildcard spelling is accepted and normalised to the bare domain (matching is by exact address or sender domain). example: partner.com type: string type: description: Rule type enum: - allow - deny type: string required: - type - pattern type: object securitySchemes: bearerAuth: bearerFormat: API Key description: >- Sendmux API key. Use a root API key for Management API routes, or a mailbox credential for Mailbox API routes. Obtain keys from the dashboard under API Keys. scheme: bearer type: http ````