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: Email
paths:
  /email:
    post:
      tags:
      - Email
      summary: Send an email
      description: Send a single transactional email. Either `text` or `html` content must be supplied.
      operationId: sendEmail
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - from
              - to
              properties:
                from:
                  type: object
                  required:
                  - email
                  properties:
                    email:
                      type: string
                      format: email
                    name:
                      type: string
                to:
                  type: array
                  items:
                    type: object
                    properties:
                      email:
                        type: string
                        format: email
                      name:
                        type: string
                subject:
                  type: string
                text:
                  type: string
                html:
                  type: string
                template_id:
                  type: string
      responses:
        '202':
          description: Email queued; response includes `x-message-id` header.
        '422':
          description: Validation error
components:
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API token generated in MailerSend dashboard.