openapi: 3.1.0 info: title: MailerSend Bulk Email Sender Identities API description: MailerSend's REST API provides endpoints for sending transactional and bulk emails, retrieving message activity, and managing templates, domains, sender identities, scheduled messages, and webhooks. Authentication uses a Bearer API token. Single email sends are asynchronous and return an `x-message-id` response header. version: 1.0.0 contact: name: MailerSend url: https://developers.mailersend.com/ servers: - url: https://api.mailersend.com/v1 description: Production security: - BearerAuth: [] tags: - name: Sender Identities paths: /identities: get: tags: - Sender Identities summary: List sender identities operationId: listIdentities responses: '200': description: Identities post: tags: - Sender Identities summary: Create sender identity operationId: createIdentity requestBody: required: true content: application/json: schema: type: object responses: '201': description: Identity components: securitySchemes: BearerAuth: type: http scheme: bearer description: API token generated in MailerSend dashboard.