> ## 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 clean thread content > Returns a cursor-paginated clean JSON view of messages in a thread. Attachment output is metadata only; attachment contents are not parsed by this endpoint. ## OpenAPI ````yaml /openapi-app.json get /mailbox/threads/{thread_id}/content 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: /mailbox/threads/{thread_id}/content: get: tags: - Mailbox API summary: Get clean thread content description: >- Returns a cursor-paginated clean JSON view of messages in a thread. Attachment output is metadata only; attachment contents are not parsed by this endpoint. operationId: mailboxGetThreadContent parameters: - in: path name: thread_id required: true schema: type: string - in: query name: part required: false schema: description: Body part to return. `auto` prefers text when available. enum: - auto - text - html type: string - in: query name: max_body_chars required: false schema: description: Maximum body characters to return before truncation. maximum: 1000000 minimum: 1 type: integer - in: query name: strip_signature required: false schema: description: When true, remove detected email signatures. type: boolean - in: query name: strip_quotes required: false schema: description: When true, remove quoted reply text. type: boolean - in: query name: include_links required: false schema: description: When true, include links extracted from the body. type: boolean - in: query name: include_html required: false schema: description: When true, include HTML content when available. type: boolean - in: query name: include_headers required: false schema: description: Header detail to include in the response. enum: - none - selected - full type: string - in: query name: include_attachments required: false schema: description: Attachment detail to include. Contents are not returned. enum: - none - metadata type: string - in: query name: cursor required: false schema: type: string - in: query name: limit required: false schema: maximum: 100 minimum: 1 type: integer - in: query name: sort required: false schema: enum: - asc - desc type: string - in: header name: If-None-Match required: false schema: type: string - description: >- Mailbox public ID to target when the credential grants access to more than one mailbox. Omit when the credential is scoped to exactly one mailbox. in: query name: mailbox_id required: false schema: type: string responses: '200': content: application/json: schema: $ref: '#/components/schemas/MailboxThreadContentResponse' description: Clean thread content '304': description: Not modified '400': content: application/json: schema: $ref: '#/components/schemas/ApiError' description: Invalid query parameter '404': content: application/json: schema: $ref: '#/components/schemas/ApiError' description: Thread not found security: - bearerAuth: [] components: schemas: MailboxThreadContentResponse: allOf: - $ref: '#/components/schemas/SuccessEnvelope' - properties: data: items: allOf: - $ref: '#/components/schemas/MailboxMessageContent' - type: object type: array meta: $ref: '#/components/schemas/MailboxThreadContentMeta' pagination: $ref: '#/components/schemas/CursorPagination' required: - data - pagination 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 MailboxMessageContent: additionalProperties: false properties: attachments: description: >- Attachment metadata only. Attachment contents are not parsed by this endpoint. items: $ref: '#/components/schemas/MailboxAttachment' type: array body: additionalProperties: false properties: extracted_links: items: type: string type: array format: enum: - text - html type: - string - 'null' html: description: >- HTML body when requested. Returned as a JSON string and not as rendered content. type: - string - 'null' is_truncated: type: boolean quotes_stripped: type: boolean signature_stripped: type: boolean text: type: - string - 'null' truncated_at_chars: type: - integer - 'null' required: - format - text - html - is_truncated - truncated_at_chars - signature_stripped - quotes_stripped - extracted_links type: object dates: additionalProperties: false properties: received_at: type: - string - 'null' sent_at: type: - string - 'null' required: - received_at - sent_at type: object headers: $ref: '#/components/schemas/MailboxContentHeaders' id: description: Message ID type: string participants: additionalProperties: false properties: bcc: items: $ref: '#/components/schemas/MailboxAddress' type: array cc: items: $ref: '#/components/schemas/MailboxAddress' type: array from: allOf: - $ref: '#/components/schemas/MailboxAddress' - type: - object - 'null' reply_to: items: $ref: '#/components/schemas/MailboxAddress' type: array to: items: $ref: '#/components/schemas/MailboxAddress' type: array required: - from - to - cc - bcc - reply_to type: object states: additionalProperties: false properties: email_state: type: - string - 'null' option_hash: type: string required: - email_state - option_hash type: object subject: type: - string - 'null' thread_id: type: - string - 'null' required: - id - thread_id - subject - participants - dates - body - headers - attachments - states type: - object - 'null' MailboxThreadContentMeta: additionalProperties: false properties: participants: items: $ref: '#/components/schemas/MailboxAddress' type: array request_id: type: string states: additionalProperties: false properties: email_state: type: - string - 'null' option_hash: type: string thread_state: type: - string - 'null' required: - thread_state - email_state - option_hash type: object thread_id: type: string required: - request_id - thread_id - participants - states type: object CursorPagination: additionalProperties: false properties: has_more: type: boolean next_cursor: type: string required: - has_more 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 MailboxAttachment: additionalProperties: false properties: content_id: description: Content ID for inline attachments, when present. type: - string - 'null' content_type: example: application/pdf type: string disposition: example: attachment type: - string - 'null' download_url: description: >- Short-lived URL for this exact attachment. Fetch it promptly; if it expires, call the message or attachment metadata endpoint again to receive a fresh URL. example: >- https://app.sendmux.ai/api/v1/mailbox/messages/msg_123/attachment-downloads/attref_abc123?download_token=... type: string filename: example: invoice.pdf type: - string - 'null' id: description: Attachment blob ID. type: string size_bytes: example: 12345 type: - integer - 'null' required: - id - filename - content_type - size_bytes - disposition - content_id type: object MailboxContentHeaders: additionalProperties: false properties: full: items: additionalProperties: false properties: name: type: string value: type: string required: - name - value type: object type: - array - 'null' mode: enum: - none - selected - full type: string selected: properties: in_reply_to: type: - string - 'null' message_id: items: type: string type: array references: items: type: string type: array reply_to: items: $ref: '#/components/schemas/MailboxAddress' type: array required: - message_id - in_reply_to - references - reply_to type: - object - 'null' required: - mode - selected - full type: object MailboxAddress: additionalProperties: false properties: email: example: agent@example.com format: email type: string name: example: Support type: - string - 'null' required: - email - name 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 ````