mailbox.org

mailbox.org provides a secure, privacy‑focused email and collaboration suite for individuals and businesses. Hosted in German data centres, it offers encrypted mail, cloud drive, video meetings, and office tools, all compliant with GDPR, ISO 27001 and BSI C5. The service emphasizes data sovereignty, green energy operation, and a range of pricing plans from personal to enterprise.

mailbox.org is listed with 2 APIs on the APIs.io network. Tagged areas include Email, Collaboration, Privacy, GDPR, and German.

The mailbox.org catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

mailbox.org’s developer surface includes documentation, support, engineering blog, and 16 more developer resources.

🌐 Visit website📡 Profile data on GitHub
23.3/100 emerging Agent 31/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
2 APIs
EmailCollaborationPrivacyGDPRGerman

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 23.3/100 · emerging
Contract Quality 4.3 / 21
Developer Ergonomics 4.5 / 17
Access Clarity 0.0 / 17
Operational Transparency 2.9 / 11
Contract Governance 2.2 / 10
Discoverability 5.0 / 9
Regulatory Posture 3.4 / 15
Agent readiness — 31/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 6 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 5 / 5
Distinct Operations 3 / 3
Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
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Agent readiness — checks not met, largest first (exact, from this profile):
  • MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
  • Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
  • Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
  • A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
  • Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
8 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/mailbox-org/apis.yml: open an issue on github.com/api-evangelist/mailbox-org to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Mailbox API

Mailbox provides an email and collaboration API documented at the welcome page.

mailbox.org API

mailbox.org API as documented publicly: 4 operations. Contract generated from the documentation by API Evangelist (2026-10-27); not the provider's own document.

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Mailbox Org Context

2 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

mailbox.org API Rules

11 rules · 9 errors 1 warnings 1 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

PostV1Request

4 properties

JSON SCHEMA

PostV1Response

3 properties

JSON SCHEMA

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Mailbox Org Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Mailbox Org Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 JSONLD
JSONLD
 Vocabulary
Vocabulary
 DataModel
DataModel
 Conformance
Conformance

Access & Security 4

Authentication, authorization, and security posture

Security
Security
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support

Company 3

The organization behind the API

Newsroom
Newsroom
 Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Hosts
Hosts

Source (apis.yml)

apis.yml Raw ↑ 
aid: mailbox-org
name: mailbox.org
image: https://mailbox.org/sites/default/files/styles/opengraph_recommended/public/2025-07/01_header_mockup_250714.jpg?h=4688e0a3&itok=an2JkaQz
description: mailbox.org provides a secure, privacy‑focused email and collaboration suite for individuals and businesses.
  Hosted in German data centres, it offers encrypted mail, cloud drive, video meetings, and office tools, all compliant with
  GDPR, ISO 27001 and BSI C5. The service emphasizes data sovereignty, green energy operation, and a range of pricing plans
  from personal to enterprise.
url: https://raw.githubusercontent.com/api-evangelist/mailbox-org/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Email
- Collaboration
- Privacy
- GDPR
- German
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/mailbox-org-rules.yml
- type: JSONLD
  url: json-ld/mailbox-org-context.jsonld
- type: Vocabulary
  url: vocabulary/mailbox-org-vocabulary.yml
- type: DataModel
  url: data-model/mailbox-org-data-model.yml
- type: Security
  url: security/mailbox-org-vulnerability-disclosure.yml
- type: Conformance
  url: conformance/mailbox-org-conformance.yml
- type: LLMsTxt
  url: llms/mailbox-org-llms.txt
- type: SecurityTxt
  url: well-known/mailbox-org-security.txt
- type: WellKnown
  url: well-known/mailbox-org-well-known.yml
- type: Hosts
  url: hosts/mailbox-org-hosts.yml
- type: Newsroom
  url: https://mailbox.org/de/news/
- type: VulnerabilityDisclosure
  url: security/mailbox-org-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/mailbox-org-domain-security.yml
- type: Website
  url: https://mailbox.org/
- type: Documentation
  url: https://kb.mailbox.org/en/
- type: DeveloperPortal
  url: https://mailbox.org/en/
- type: StatusPage
  url: https://status.mailbox.org
- type: Support
  url: https://support.mailbox.org
- type: Blog
  url: https://mailbox.org/en/blog/
apis:
- name: Mailbox API
  description: Mailbox provides an email and collaboration API documented at the welcome page.
  humanURL: https://api.mailbox.org/v1/doc/welcome/welcome.html
  baseURL: null
  aid: mailbox-org:mailbox-api
- aid: mailbox-org:mailbox-org-api
  name: mailbox.org API
  description: 'mailbox.org API as documented publicly: 4 operations. Contract generated from the documentation by API Evangelist
    (2026-10-27);

    not the provider''s own document.'
  humanURL: https://api.mailbox.org/v1/doc/welcome/API-Key-Authentication.html
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/mailbox-org-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/mailbox-org-post-v1-response-schema.json
  - type: JSONSchema
    url: json-schema/mailbox-org-post-v1-request-schema.json
x-submission-probe: 301 https://mailbox.org/de/, 2026-10-26
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Documentation is served as HTML pages without a discoverable OpenAPI, AsyncAPI, GraphQL, or other machine‑readable
    contract.
  evidence:
  - url: https://api.mailbox.org/v1/doc/welcome/welcome.html
    status: 200
  checked: '2026-10-27'
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

mailbox.org API — frequently asked questions

Does mailbox.org have an API?

Yes. APIs.io lists 2 APIs from mailbox.org, including Mailbox API and mailbox.org API.

Is there an OpenAPI specification for the mailbox.org API?

Yes. APIs.io indexes 1 OpenAPI specification for mailbox.org, each linked for download from this page.

Is the mailbox.org API ready for AI agents?

mailbox.org has a Kin Score of 23.3 out of 100 (emerging) and an Agent Readiness score of 30.6 (agent-ready), scored by API Evangelist on 2026-10-31.

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