Zoho Mail

Zoho Mail is an ad-free, privacy-first email and collaboration platform offering a comprehensive REST API for managing email accounts, folders, messages, contacts, calendars, and organizational email administration. The API supports 15 modules including Organization, Domains, Groups, Users, Mail Policy, Accounts, Folders, Labels, Email Messages, Signatures, Threads, Tasks, Bookmarks, Notes, and Logs. Authentication uses OAuth 2.0 and responses are returned in JSON format with region-specific base URLs for US, Europe, India, Australia, Japan, Canada, UAE, Saudi Arabia, and China deployments.

Zoho Mail publishes 4 API contracts indexed on the APIs.io network, including Accounts API, Folders API, Messages API, and 1 more. Tagged areas include Email, Mail, Collaboration, Messaging, and Calendar.

The Zoho Mail catalog on APIs.io includes 1 Spectral governance ruleset.

Zoho Mail’s developer surface includes authentication, documentation, engineering blog, pricing, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.4/100 thin ▬ flat Agent 25/100 agent aware Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Email Mail Collaboration Messaging Calendar Contacts Organization Management Software-as-a-Service

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 36.4/100 · thin

Contract Quality 9.0 / 19

Developer Ergonomics 5.4 / 15

Access Clarity 2.8 / 15

Operational Transparency 3.1 / 10

Contract Governance 1.2 / 9

Discoverability 5.0 / 8

Regulatory Posture 4.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 25/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 0 / 7

Rate-Limit Signaling 7 / 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 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 18.4 — up to +16.3 composite points
Contract Quality scores 48.2 — up to +13.0 composite points
Developer Ergonomics scores 35.7 — up to +12.9 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/zoho-mail/apis.yml: open an issue on github.com/api-evangelist/zoho-mail 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Workplace Collaboration App Marketplaces	builds-on	25.8	-	-
Raycast Store Extensions (first-party publishers + community-wrapped products)	builds-on	25.8	-	-
IFTTT Services (service publishers)	builds-on	25.8	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 4

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

Zoho Mail Accounts API

Manage email accounts, vacation replies, forwarding, and account settings

Zoho Mail Folders API

Create and manage email folders

Zoho Mail Messages API

Send, receive, search, and manage email messages and attachments

Zoho Mail Organization API

Admin-level organization, domain, group, user, and policy management

Open Collections 4

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Zoho Mail Accounts API

OPEN COLLECTION

Zoho Mail Accounts Folders API

OPEN COLLECTION

Zoho Mail Accounts Messages API

OPEN COLLECTION

Zoho Mail Accounts Organization API

OPEN COLLECTION

Zoho Mail API pricing

Not yet checked against Zoho Mail's own pricing page. Compiled by API Evangelist; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Mail Free	Free per user/month
Mail Lite	$1.0 per user/month
Mail Premium	$4.0 per user/month
Workplace Standard	—
Workplace Professional	—
Workplace Enterprise	—

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Zoho Mail Plans Pricing

6 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Zoho Mail Rate Limits

0 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Zoho Mail

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Zoho Mail Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Zoho Mail API Rules

73 rules · 69 errors 3 warnings 1 info

SPECTRAL

Security Posture 3

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

Zoho Mail Authentication

oauth2 · 1 scheme

SECURITY

Zoho Mail Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Zoho Mail Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Zoho Mail Scopes

11 scopes · authorizationCode

11 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Zoho Mail Agentic Access

23 operations · 10 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD

JSONLD

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

BlogPosts

BlogPosts

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: zoho-mail
name: Zoho Mail
description: Zoho Mail is an ad-free, privacy-first email and collaboration platform offering a comprehensive REST API for
  managing email accounts, folders, messages, contacts, calendars, and organizational email administration. The API supports
  15 modules including Organization, Domains, Groups, Users, Mail Policy, Accounts, Folders, Labels, Email Messages, Signatures,
  Threads, Tasks, Bookmarks, Notes, and Logs. Authentication uses OAuth 2.0 and responses are returned in JSON format with
  region-specific base URLs for US, Europe, India, Australia, Japan, Canada, UAE, Saudi Arabia, and China deployments.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zoho-mail.png
url: https://raw.githubusercontent.com/api-evangelist/zoho-mail/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- Email
- Mail
- Collaboration
- Messaging
- Calendar
- Contacts
- Organization Management
- Software-as-a-Service
tags_raw:
- Email
- Mail
- Collaboration
- Messaging
- Calendar
- Contacts
- Organization Management
- SaaS
apis:
- aid: zoho-mail:zoho-mail-accounts-api
  name: Zoho Mail Accounts API
  description: Manage email accounts, vacation replies, forwarding, and account settings
  humanURL: https://www.zoho.com/mail/help/api/overview.html
  baseURL: https://mail.zoho.com/api
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/zoho-mail-accounts-api-openapi.yml
  - type: Documentation
    url: https://www.zoho.com/mail/help/api/overview.html
  - type: GettingStarted
    url: https://www.zoho.com/mail/help/api/getting-started-with-api.html
  - type: Authentication
    url: https://www.zoho.com/mail/help/api/using-oauth-2.html
  - type: OpenAPISpec
    url: https://prezohoweb.zoho.com/mail/help/api/openapi-specification.html
- aid: zoho-mail:zoho-mail-folders-api
  name: Zoho Mail Folders API
  description: Create and manage email folders
  humanURL: https://www.zoho.com/mail/help/api/overview.html
  baseURL: https://mail.zoho.com/api
  tags:
  - Folders
  properties:
  - type: OpenAPI
    url: openapi/zoho-mail-folders-api-openapi.yml
  - type: Documentation
    url: https://www.zoho.com/mail/help/api/overview.html
  - type: GettingStarted
    url: https://www.zoho.com/mail/help/api/getting-started-with-api.html
  - type: Authentication
    url: https://www.zoho.com/mail/help/api/using-oauth-2.html
  - type: OpenAPISpec
    url: https://prezohoweb.zoho.com/mail/help/api/openapi-specification.html
- aid: zoho-mail:zoho-mail-messages-api
  name: Zoho Mail Messages API
  description: Send, receive, search, and manage email messages and attachments
  humanURL: https://www.zoho.com/mail/help/api/overview.html
  baseURL: https://mail.zoho.com/api
  tags:
  - Message
  tags_raw:
  - Messages
  properties:
  - type: OpenAPI
    url: openapi/zoho-mail-messages-api-openapi.yml
  - type: Documentation
    url: https://www.zoho.com/mail/help/api/overview.html
  - type: GettingStarted
    url: https://www.zoho.com/mail/help/api/getting-started-with-api.html
  - type: Authentication
    url: https://www.zoho.com/mail/help/api/using-oauth-2.html
  - type: OpenAPISpec
    url: https://prezohoweb.zoho.com/mail/help/api/openapi-specification.html
- aid: zoho-mail:zoho-mail-organization-api
  name: Zoho Mail Organization API
  description: Admin-level organization, domain, group, user, and policy management
  humanURL: https://www.zoho.com/mail/help/api/overview.html
  baseURL: https://mail.zoho.com/api
  tags:
  - Organization
  properties:
  - type: OpenAPI
    url: openapi/zoho-mail-organization-api-openapi.yml
  - type: Documentation
    url: https://www.zoho.com/mail/help/api/overview.html
  - type: GettingStarted
    url: https://www.zoho.com/mail/help/api/getting-started-with-api.html
  - type: Authentication
    url: https://www.zoho.com/mail/help/api/using-oauth-2.html
  - type: OpenAPISpec
    url: https://prezohoweb.zoho.com/mail/help/api/openapi-specification.html
common:
- type: AgenticAccess
  url: agentic-access/zoho-mail-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/zoho-mail-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/zoho-mail-domain-security.yml
- type: Authentication
  url: authentication/zoho-mail-authentication.yml
- type: OAuthScopes
  url: scopes/zoho-mail-scopes.yml
- type: Website
  url: https://www.zoho.com/mail/
- type: Documentation
  url: https://www.zoho.com/mail/help/api/overview.html
- type: GitHubOrg
  url: https://github.com/zoho
- type: LinkedIn
  url: https://in.linkedin.com/company/zoho-mail
- type: Blog
  url: https://blog.zoho.com/mail
- type: Pricing
  url: https://www.zoho.com/mail/zohomail-pricing.html
- type: StatusPage
  url: https://status.zoho.com
- type: X
  url: https://x.com/zohomail
- type: Plans
  url: plans/zoho-mail-plans-pricing.yml
- type: RateLimits
  url: rate-limits/zoho-mail-rate-limits.yml
- type: FinOps
  url: finops/zoho-mail-finops.yml
- type: BlogPosts
  url: blogs/blogs.json
- type: JSONLD
  url: json-ld/zoho-mail.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: zoho
x-relationship: product

Zoho Mail API — frequently asked questions

Does Zoho Mail have an API?

Yes. APIs.io lists 4 APIs from Zoho Mail, including Zoho Mail Accounts API, Zoho Mail Folders API and Zoho Mail Messages API, and 1 more.

Is there an OpenAPI specification for the Zoho Mail API?

Yes. APIs.io indexes 4 OpenAPI specifications for Zoho Mail, each linked for download from this page.

How do I authenticate with the Zoho Mail API?

Zoho Mail documents its authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Zoho Mail Authentication.

How much does the Zoho Mail API cost?

APIs.io lists 6 pricing plans for Zoho Mail, with each plan's price, limits and inclusions under Pricing on this page.

Is the Zoho Mail API ready for AI agents?

Zoho Mail has a Kin Score of 36.4 out of 100 (thin) and an Agent Readiness score of 24.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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