Apache James
Apache James (Java Apache Mail Enterprise Server) is a portable and enterprise-ready mail server built entirely in Java. It implements SMTP, IMAP, POP3, and JMAP protocols and provides a modular architecture with a comprehensive administration REST API and Cassandra-backed distributed deployment.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Apache James the way a machine reads it — 72 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Apache James scores 38.6/100 (thin), with a separate agent-readiness read of 27/100 (agent aware). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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How we profile Apache James
Each block below is one kind of artifact we hold for Apache James. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 9
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Apache James JMAP API
The JMAP (JSON Meta Application Protocol) implementation in James provides a modern, efficient email protocol for synchronizing messages, mailboxes, contacts, and calendars for ...
Apache James Domains API
Email domain management
Apache James HealthCheck API
System health monitoring
Apache James Mailboxes API
Mailbox management
Apache James MailQueues API
Mail queue management
Apache James MailRepositories API
Mail repository management
Apache James Quotas API
Storage and message quota management
Apache James Tasks API
Asynchronous task management
Apache James Users API
User account management
Scroll within the panel for all 9 ·
Open Collections 9
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONApache James WebAdmin REST Domains API
OPEN COLLECTIONApache James WebAdmin REST Domains HealthCheck API
OPEN COLLECTIONApache James WebAdmin REST Domains Mailboxes API
OPEN COLLECTIONApache James WebAdmin REST Domains MailQueues API
OPEN COLLECTIONApache James WebAdmin REST Domains MailRepositories API
OPEN COLLECTIONApache James WebAdmin REST Domains Quotas API
OPEN COLLECTIONApache James WebAdmin REST Domains Tasks API
OPEN COLLECTIONApache James WebAdmin REST Domains Users API
OPEN COLLECTIONScroll within the panel for all 9 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Apache James Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Apache James Finops
FINOPSFeatures 8
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
SMTP Server
Full SMTP server implementation with TLS, DKIM, SPF, and DMARC support.
IMAP Server
IMAP4 server with full RFC compliance for email client access.
JMAP Support
Modern JMAP protocol implementation for efficient email synchronization.
WebAdmin REST API
HTTP REST API for complete server administration without downtime.
Distributed Architecture
Cassandra-backed distributed deployment for high availability.
Modular Design
Pluggable architecture supporting custom protocols, storage, and authentication.
Mail Queuing
Persistent mail queuing with configurable retry strategies.
Quota Management
Per-user, per-domain, and global mailbox and message quota enforcement.
Scroll within the panel for all 8 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Spectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Apache James API Rules
SPECTRALApache James API Rules
SPECTRALJSON Schema 9
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
ComponentCheck
JSON SCHEMADomainRequest
JSON SCHEMAHealthCheckResult
JSON SCHEMAMailRepository
JSON SCHEMAMailbox
JSON SCHEMAQuota
JSON SCHEMATask
JSON SCHEMAUserRequest
JSON SCHEMAUser
JSON SCHEMAScroll within the panel for all 9 ·
JSON Structure 9
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Webadmin Rest Api Component Check Structure
JSON STRUCTUREWebadmin Rest Api Domain Request Structure
JSON STRUCTUREWebadmin Rest Api Health Check Result Structure
JSON STRUCTUREWebadmin Rest Api Mail Repository Structure
JSON STRUCTUREWebadmin Rest Api Mailbox Structure
JSON STRUCTUREWebadmin Rest Api Quota Structure
JSON STRUCTUREWebadmin Rest Api Task Structure
JSON STRUCTUREWebadmin Rest Api User Request Structure
JSON STRUCTUREWebadmin Rest Api User Structure
JSON STRUCTUREScroll within the panel for all 9 ·
Examples 9
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Scroll within the panel for all 9 ·
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Use Cases 4
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Enterprise Mail Server
Deploy a full-featured enterprise mail server with SMTP, IMAP, and JMAP.
Mail Server Migration
Migrate from other mail servers with full protocol compatibility.
Automated Email Processing
Build automated email pipelines using James mailet and matcher APIs.
High-Availability Mail
Deploy distributed James clusters with Cassandra and RabbitMQ for HA.
Integrations 5
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Apache Cassandra
Distributed mail storage backend for high availability deployments.
Apache Kafka
Event bus integration for distributed James deployments.
RabbitMQ
AMQP message queue for inter-node communication.
Elasticsearch/OpenSearch
Full-text mail search indexing via Elasticsearch integration.
OpenLDAP
LDAP authentication and directory integration for user management.
Resources
Every other property we hold for Apache James — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 3
SDKs, sample code, and the tooling you integrate with
Access & Security 3
Authentication, authorization, and security posture
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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This is an independent, third-party profile of Apache James, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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