Zimbra

Zimbra is an open-source email and collaboration platform serving more than 200 million users worldwide, offering email, calendar, contacts, tasks, group chat, file storage (Briefcase), and an in-browser office suite. It is deployed self-hosted (on-premises, private cloud, or regional data center) to give organizations full data sovereignty over their communications. Zimbra's programmatic surface is a SOAP API (account, mail, and admin namespaces) wrapped by a first-party GraphQL/JavaScript client (@zimbra/api-client); it also speaks the IMAP, POP3, SMTP, CalDAV, CardDAV, and Exchange ActiveSync standards. There is no public OpenAPI/REST contract. Backed by Redpoint Ventures; added to the API Evangelist network from a VC-portfolio lead and enriched from Zimbra's public developer surface.

Zimbra publishes 1 API on the APIs.io network. Tagged areas include Email, Collaboration, Calendar, Messaging, and Open Source.

Zimbra’s developer surface includes documentation, API reference, engineering blog, support, signup flow, authentication, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub
24.7/100 emerging ▬ flat Agent 10/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
1 APIs
EmailCollaborationCalendarMessagingOpen SourceSOAPGraphQLProductivity

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 24.7/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 7.8 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 2.1 / 13
Governance 0.0 / 12
Discoverability 8.0 / 10
Agent readiness — 10/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/zimbra: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

Zimbra SOAP API

SOAP API (XML and JSON encodings) for Zimbra Collaboration — account, mail, and admin operations, POSTed to /service/soap on a Zimbra deployment. Self-hosted, so the base host i...

Security Posture 3

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

Zimbra Authentication

soap-auth-token/preauth/oauth2 · 4 schemes

SECURITY

Zimbra Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zimbra Vulnerability Disclosure

disclosure policy published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Lifecycle
Lifecycle
 Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 4

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity
 VulnerabilityDisclosure
VulnerabilityDisclosure
 Security
Security

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: zimbra
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zimbra.png
name: Zimbra
description: Zimbra is an open-source email and collaboration platform serving more than 200 million users worldwide, offering
  email, calendar, contacts, tasks, group chat, file storage (Briefcase), and an in-browser office suite. It is deployed self-hosted
  (on-premises, private cloud, or regional data center) to give organizations full data sovereignty over their communications.
  Zimbra's programmatic surface is a SOAP API (account, mail, and admin namespaces) wrapped by a first-party GraphQL/JavaScript
  client (@zimbra/api-client); it also speaks the IMAP, POP3, SMTP, CalDAV, CardDAV, and Exchange ActiveSync standards. There
  is no public OpenAPI/REST contract. Backed by Redpoint Ventures; added to the API Evangelist network from a VC-portfolio
  lead and enriched from Zimbra's public developer surface.
url: https://raw.githubusercontent.com/api-evangelist/zimbra/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- redpoint-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Email
- Collaboration
- Calendar
- Messaging
- Open Source
- SOAP
- GraphQL
- Productivity
apis:
- name: Zimbra SOAP API
  description: SOAP API (XML and JSON encodings) for Zimbra Collaboration — account, mail, and admin operations, POSTed to
    /service/soap on a Zimbra deployment. Self-hosted, so the base host is per-deployment; the reference documents every request/response.
  humanURL: https://files.zimbra.com/docs/soap_api/
  properties:
  - type: APIReference
    url: https://files.zimbra.com/docs/soap_api/
  - type: Documentation
    url: https://wiki.zimbra.com/wiki/SOAP_API_Reference_Material_Beginning_with_ZCS_8.0
  - type: SDKs
    url: packages/zimbra-packages.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.zimbra.com/
- type: Documentation
  url: https://www.zimbra.com/product/zimbra-documentation/
- type: APIReference
  url: https://files.zimbra.com/docs/soap_api/
- type: Blog
  url: https://blog.zimbra.com/
- type: Support
  url: https://support.zimbra.com/
- type: GitHubOrganization
  url: https://github.com/Zimbra
- type: SignUp
  url: https://www.zimbra.com/connect/forms/?form=trial-license
- type: TermsOfService
  url: https://www.zimbra.com/product/licenses-and-terms-of-use/
- type: PrivacyPolicy
  url: https://synacor.com/privacy-policy
- type: Packages
  url: packages/zimbra-packages.yml
- type: SDKs
  url: packages/zimbra-packages.yml
- type: Authentication
  url: authentication/zimbra-authentication.yml
- type: Conventions
  url: conventions/zimbra-conventions.yml
- type: Lifecycle
  url: lifecycle/zimbra-lifecycle.yml
- type: Conformance
  url: conformance/zimbra-conformance.yml
- type: LLMsTxt
  url: llms/zimbra-llms.txt
- type: DomainSecurity
  url: security/zimbra-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/zimbra-vulnerability-disclosure.yml
- type: Security
  url: https://wiki.zimbra.com/wiki/Security_Center
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 9
  pass: local-v1