Exclaimer

Exclaimer Mailboxes API

The Mailboxes API from Exclaimer — 1 operation(s) for mailboxes.

Documentation GitHub OpenAPI

Operations 2

GET /1.0/subscriptions/{SubscriptionID}/mailbox-count Get Mailbox Count

PUT /1.0/subscriptions/{SubscriptionID}/mailbox-count Update Mailbox Count

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/exclaimer-mailboxes-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 email required.

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: Exclaimer Cloud Mailboxes API
  version: '1'
  description: The Mailboxes operations of the Exclaimer Cloud API, the partner/distributor provisioning API for Exclaimer Cloud tenants. Split by tag from the provider-published OpenAPI at https://cloudapi.exclaimer.com/openapi.json (documentation version 5.2, published 2025-07-23). Operation content is carried verbatim from the source specification.
servers:
- url: https://cloudapi.exclaimer.com/exclaimerapi
  description: Local
security:
- Exclaimer: []
tags:
- name: Mailboxes
paths:
  /1.0/subscriptions/{SubscriptionID}/mailbox-count:
    get:
      tags:
      - Mailboxes
      summary: Get Mailbox Count
      description: This request will return the number of unique mailboxes (applied on the server, or from a client) over the last 30 days. These number are updated at least once daily.
      parameters:
      - name: SubscriptionID
        in: path
        description: Your reference for the subscription. This is the same ID you specified, or was automatically generated, when the subscription was created, i.e., when calling <b>Add Subscription</b>.
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MailboxCountResponse'
              examples:
                Basic response:
                  value: '{"MailboxCount":23,"ClientSideMailboxCount":29}'
        '400':
          description: Bad Request / Missing Field
        '401':
          description: Unauthorized
        '404':
          description: Not Found
        '500':
          description: Internal Server Error
      x-documentation:
        curlExamples:
          Basic usage - cURL:
            description: /subscriptions/EX-Subscription-001/mailbox-count
            value: '{}'
    put:
      tags:
      - Mailboxes
      summary: Update Mailbox Count
      description: This request will update the number of users (mailboxes) for a subscription.
      parameters:
      - name: SubscriptionID
        in: path
        description: Your reference for the subscription. This is the same ID you specified, or was automatically generated, when the subscription was created, i.e., when calling Add Subscription.
        required: true
        schema:
          type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/UpdateMailboxCount'
            examples:
              Basic usage:
                value: '{"MailboxCount":23}'
      responses:
        '204':
          description: No Content
        '400':
          description: Bad Request / Missing Field
        '401':
          description: Unauthorized
        '404':
          description: Not Found
        '415':
          description: Unsupported Media Type
        '500':
          description: Internal Server Error
      x-documentation:
        curlExamples:
          Basic usage - cURL:
            description: /subscriptions/EX-Subscription-001/mailbox-count
            value: '{"MailboxCount":20}'
components:
  schemas:
    UpdateMailboxCount:
      title: UpdateMailboxCountRequest
      required:
      - MailboxCount
      properties:
        MailboxCount:
          type: number
          description: The total number of mailboxes for the subscription. For new accounts there is a restriction on the minimum value, ruling it may not be set less than the current number of imprinted mailboxes. <p> Where the caller is a <b>Managed Service Provider</b> on the <b>Elite Program</b> the mailbox increment must not cause the total count across all subscriptions to exceed the Mailbox Allocation. </p>
          format: int32
      description: This request will update the number of users (mailboxes) for a subscription.
    MailboxCountResponse:
      title: MailboxCountResponse
      properties:
        MailboxCount:
          type: number
          description: The number of imprinted signatures applied as the email went through your email system.
          format: int32
        ClientSideMailboxCount:
          type: number
          description: The number of downloaded signatures added directly via a client running on a machine, e.g. in Outlook.
          format: int32
  securitySchemes:
    Exclaimer:
      type: apiKey
      name: ExApiToken
      in: header