mailcow

Mailcow provides a dockerized mail server suite, offering a full-featured, self‑hosted email solution with webmail, spam filtering, antivirus, and advanced management tools. It is maintained by The Infrastructure Company GmbH and supports modern protocols, multiple domains, and extensive configuration options, targeting both small businesses and larger enterprises seeking control over their email infrastructure.

mailcow is profiled on the APIs.io network. Tagged areas include Company, Email, Docker, OpenSource, and SelfHosted.

mailcow’s developer surface includes getting-started guide, documentation, support, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

12.6/100 emerging Agent 18/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

0 APIs

Company Email DockerOpenSourceSelfHosted

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 12.6/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 5.3 / 17

Access Clarity 0.0 / 17

Operational Transparency 1.7 / 11

Contract Governance 0.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 1.8 / 15

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 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 5 / 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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)

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 31.0 — up to +13.8 composite points

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/mailcow/apis.yml: open an issue on github.com/api-evangelist/mailcow 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 →

Security Posture 1

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

Mailcow Domain Security

TLSv1.3 · DNSSEC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Postman

Postman

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: mailcow
name: mailcow
image: https://mailcow.email/images/cow_mailcow.svg
description: Mailcow provides a dockerized mail server suite, offering a full-featured, self‑hosted email solution with webmail,
  spam filtering, antivirus, and advanced management tools. It is maintained by The Infrastructure Company GmbH and supports
  modern protocols, multiple domains, and extensive configuration options, targeting both small businesses and larger enterprises
  seeking control over their email infrastructure.
url: https://raw.githubusercontent.com/api-evangelist/mailcow/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Company
- Email
- Docker
- OpenSource
- SelfHosted
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: WellKnown
  url: well-known/mailcow-well-known.yml
- type: Hosts
  url: hosts/mailcow-hosts.yml
- type: Vendors
  url: vendors/mailcow-vendors.yml
- type: Security
  url: https://mailcow.email/tags/security/
- type: GettingStarted
  url: https://docs.mailcow.email/post_installation/setup-mta-sts/
- type: DomainSecurity
  url: security/mailcow-domain-security.yml
- type: Website
  url: https://mailcow.email/
- type: Documentation
  url: https://mailcow.github.io/mailcow-dockerized-docs/
- type: Support
  url: https://www.servercow.de/mailcow?lang=en#support
- type: GitHubOrganization
  url: https://github.com/mailcow
- type: Postman
  url: https://www.postman.com/mailcow/workspace/mailcow-api/
apis: []
x-submission-probe: 200, 2026-10-26
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation pages are rendered via JavaScript and no machine‑readable OpenAPI spec was found.
  evidence:
  - url: https://mailcow.github.io/mailcow-dockerized-docs/api/
    status: 301
  checked: '2026-10-28'
x-enrichment:
  date: '2026-10-28'
  status: enriched
  artifacts_added: 12
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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