Mailosaur

Mailosaur Files API

Operations for downloading the raw content associated with a message — file attachments, the full EML source of an email, and rendered email previews.

Documentation GitHub OpenAPI

Operations 3

GET /api/files/attachments/{attachmentId} Download an attachment #

GET /api/files/email/{messageId} Download email as EML #

GET /api/files/screenshots/{previewId} Download an email preview screenshot #

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/mailosaur-files-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: Mailosaur Analysis Files API
  description: REST API for email and SMS testing. Provides endpoints for managing test inboxes (servers), retrieving and searching messages, running deliverability checks, generating OTPs for authenticator testing, and accessing account usage data. All requests authenticate via HTTP Basic Auth using an API key.
  version: 1.0.0
  contact:
    name: Mailosaur Support
    url: https://mailosaur.com/docs/api
  termsOfService: https://mailosaur.com/terms
  license:
    name: Commercial
    url: https://mailosaur.com/terms
servers:
- url: https://mailosaur.com
  description: Mailosaur production API
security:
- basicAuth: []
tags:
- name: Files
  description: Operations for downloading the raw content associated with a message — file attachments, the full EML source of an email, and rendered email previews.
paths:
  /api/files/attachments/{attachmentId}:
    get:
      operationId: getAttachment
      summary: Download an attachment
      description: Downloads a single attachment.
      tags:
      - Files
      parameters:
      - name: attachmentId
        in: path
        required: true
        description: The identifier for the required attachment.
        schema:
          type: string
      responses:
        '200':
          description: The attachment binary content.
          content:
            application/octet-stream:
              schema:
                type: string
                format: binary
  /api/files/email/{messageId}:
    get:
      operationId: getEmailFile
      summary: Download email as EML
      description: Downloads an EML file representing the specified email.
      tags:
      - Files
      parameters:
      - $ref: '#/components/parameters/messageId'
      responses:
        '200':
          description: The raw EML content of the email.
          content:
            message/rfc822:
              schema:
                type: string
                format: binary
  /api/files/screenshots/{previewId}:
    get:
      operationId: getEmailPreview
      summary: Download an email preview screenshot
      description: Downloads a screenshot of your email rendered in a real email client. Simply supply the unique identifier for the required preview. Returns 202 while the preview is still being generated.
      tags:
      - Files
      parameters:
      - name: previewId
        in: path
        required: true
        description: The identifier of the email preview to be downloaded.
        schema:
          type: string
      responses:
        '200':
          description: The preview screenshot image.
          content:
            image/png:
              schema:
                type: string
                format: binary
        '202':
          description: The preview is still being generated. Poll again shortly.
components:
  parameters:
    messageId:
      name: messageId
      in: path
      required: true
      description: The unique identifier of the message.
      schema:
        type: string
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic Auth using your Mailosaur API key as the username and an empty password, or your API key as both username and password.