MailerSend Bulk Email API

openapi: 3.1.0
info:
  title: MailerSend Bulk Email 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: Bulk Email
paths:
  /bulk-email:
    post:
      tags:
      - Bulk Email
      summary: Send bulk emails
      description: Send up to 500 emails per request (paid plans). Returns a `bulk_email_id` for status queries.
      operationId: sendBulkEmail
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                type: object
      responses:
        '202':
          description: Bulk job accepted
        '422':
          description: Validation error
  /bulk-email/{bulk_email_id}:
    get:
      tags:
      - Bulk Email
      summary: Get bulk email status
      operationId: getBulkEmailStatus
      parameters:
      - name: bulk_email_id
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Bulk status with validation errors and failed messages
        '404':
          description: Bulk email ID not found
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API token generated in MailerSend dashboard.