> ## Documentation Index > Fetch the complete documentation index at: https://openphone-dev.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Retry a failed message > Attempt to re-deliver a message that previously failed to send. Only messages with a `failed` status can be retried. Messages that have permanently failed (a `failed` status with an error code) and messages with an `undelivered` status cannot be retried. ## OpenAPI ````yaml https://openphone-public-api-dev.s3.us-west-2.amazonaws.com/public/openphone-public-api-2026-03-30-dev.json post /messages/{messageId}/retry openapi: 3.1.0 info: title: Quo Public API version: 1.0.0 description: API for connecting with Quo. contact: name: Quo Support email: support@quo.com url: https://support.quo.com/ termsOfService: https://www.quo.com/terms servers: - description: Development server url: https://dev-public-api.openphone.dev security: - apiKey: [] tags: - description: Operations related to calls name: Calls - description: >- Operations related to call summaries, including AI-generated summaries and Sona voice assistant summaries name: Call Summaries - description: >- Operations related to call transcripts, including AI-generated transcripts and Sona voice assistant transcripts name: Call Transcripts - description: Operations related to contacts name: Contacts - description: Operations related to contact properties name: Contact Properties - description: Operations related to conversations name: Conversations - description: Operations related to text messages name: Messages - description: Operations related to phone numbers name: Phone Numbers - description: Operations related to users name: Users - description: Operations related to webhooks name: Webhooks - description: >- Operations related to webhook events, including delivery history and test events name: Webhook Events paths: /messages/{messageId}/retry: post: tags: - Messages summary: Retry a failed message description: >- Attempt to re-deliver a message that previously failed to send. Only messages with a `failed` status can be retried. Messages that have permanently failed (a `failed` status with an error code) and messages with an `undelivered` status cannot be retried. operationId: retryMessage parameters: - in: path name: messageId required: true schema: description: The unique identifier of the message to retry examples: - AC123abc pattern: ^AC(.*)$ type: string example: AC123abc - in: header name: Quo-Api-Version required: true schema: type: string enum: - '2026-03-30' description: 'API version header. Supported values: 2026-03-30' responses: '202': description: Accepted content: application/json: schema: type: object properties: {} '400': description: Bad Request content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Bad Request type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: The input was invalid docs: https://quo.com/docs title: Bad Request errors: - path: /messageId message: Expected string to match '^AC(.*)$' value: abc123 schema: type: TemplateLiteral pattern: ^AC(.*)$ '401': description: Unauthorized content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Unauthorized type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: Unauthorized docs: https://quo.com/docs title: Unauthorized trace: '6897907457496870895' '403': description: Forbidden content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Forbidden type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: The user is forbidden from accessing the message docs: https://quo.com/docs title: Forbidden trace: '6897907457496870895' '404': description: Not Found content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Not Found type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: Message not found docs: https://quo.com/docs title: Not Found trace: '6897907457496870895' '422': description: Unprocessable Entity content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Unprocessable Entity type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: The message has permanently failed and cannot be retried docs: https://quo.com/docs title: Unprocessable Entity trace: '6897907457496870895' '500': description: Unknown Error content: application/json: schema: type: object required: - message - docs - title properties: message: type: string docs: const: https://quo.com/docs type: string title: const: Unknown type: string trace: type: string errors: type: array items: type: object required: - path - message - schema properties: path: type: string message: type: string value: {} schema: type: object required: - type properties: type: type: string example: message: We have encountered an unknown error docs: https://quo.com/docs title: Unknown trace: '6897907457496870895' security: - apiKey: [] components: securitySchemes: apiKey: in: header name: Authorization type: apiKey ````