EmailEngine

EmailEngine is a self-hosted email automation platform that provides a unified REST API for accessing email accounts via IMAP, SMTP, the Gmail API, and the Microsoft Graph API. It exposes JSON payloads, real-time webhooks, OAuth2 integration, an IMAP/SMTP proxy, hosted authentication forms, low-code custom integrations, Prometheus monitoring, and bounce detection so developers can build modern email functionality without paying per-account fees.

EmailEngine is listed with 13 APIs on the APIs.io network, including Account API, Accounts API, Autoconfig API, and 10 more. Tagged areas include Email, Email API, IMAP, SMTP, and Webhook.

The EmailEngine catalog on APIs.io includes 1 Spectral governance ruleset.

EmailEngine’s developer surface includes documentation, API reference, engineering blog, FAQ, pricing, support, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

26.7/100 thin ▬ flat Agent 21/100 agent aware Front door AI 6/6 dominant Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

13 APIs

Email Email API IMAP SMTP Webhook

Kin Score

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

Composite quality — 26.7/100 · thin

Contract Quality 0.0 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 5.9 / 15

Operational Transparency 4.6 / 10

Contract Governance 1.2 / 9

Discoverability 5.4 / 8

Regulatory Posture 2.1 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 0 / 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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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

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
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Access Clarity scores 39.5 — up to +12.1 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/emailengine/apis.yml: open an issue on github.com/api-evangelist/emailengine 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 →

Standards implemented 3

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.

IMAP

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

SMTP

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

APIs 13

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

EmailEngine Account API

The Account API from EmailEngine — 3 operation(s) for account.

EmailEngine Accounts API

The Accounts API from EmailEngine — 1 operation(s) for accounts.

EmailEngine Autoconfig API

The Autoconfig API from EmailEngine — 1 operation(s) for autoconfig.

EmailEngine Deliverytest API

The Deliverytest API from EmailEngine — 1 operation(s) for deliverytest.

EmailEngine Gateways API

The Gateways API from EmailEngine — 1 operation(s) for gateways.

EmailEngine License API

The License API from EmailEngine — 1 operation(s) for license.

EmailEngine Logs API

The Logs API from EmailEngine — 1 operation(s) for logs.

EmailEngine Outbox API

The Outbox API from EmailEngine — 1 operation(s) for outbox.

EmailEngine Stats API

The Stats API from EmailEngine — 1 operation(s) for stats.

EmailEngine Templates API

The Templates API from EmailEngine — 1 operation(s) for templates.

EmailEngine Tokens API

The Tokens API from EmailEngine — 1 operation(s) for tokens.

EmailEngine Webhookroutes API

The Webhookroutes API from EmailEngine — 1 operation(s) for webhookroutes.

EmailEngine Oauth2 API

The Oauth2 API from EmailEngine — 1 operation(s) for oauth2.

Scroll for all 13

Open Collections 14

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

EmailEngine Account API

OPEN COLLECTION

EmailEngine Account Accounts API

OPEN COLLECTION

EmailEngine Account Autoconfig API

OPEN COLLECTION

EmailEngine Account Deliverytest API

OPEN COLLECTION

EmailEngine Account Gateways API

OPEN COLLECTION

EmailEngine Account License API

OPEN COLLECTION

EmailEngine Account Logs API

OPEN COLLECTION

EmailEngine Account Oauth2 API

OPEN COLLECTION

EmailEngine Account Outbox API

OPEN COLLECTION

EmailEngine Account Stats API

OPEN COLLECTION

EmailEngine Account Templates API

OPEN COLLECTION

EmailEngine Account Tokens API

OPEN COLLECTION

EmailEngine Account Webhookroutes API

OPEN COLLECTION

EmailEngine API

OPEN COLLECTION

Scroll for all 14

EmailEngine API pricing

Not yet checked against EmailEngine's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against EmailEngine's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Emailengine Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Emailengine Rate Limits

5 limits

RATE LIMITS

Service Levels 1

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

EmailEngine

SLA

FinOps 1

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

Emailengine Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

EmailEngine API Rules

35 rules · 33 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

Emailengine Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Emailengine Agentic Access

15 operations · 1 acting

AGENTIC

Resources

Documentation 3

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Webhooks

Webhooks

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

SourceCode

SourceCode

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

RateLimits

Releases

FAQ

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: emailengine
name: EmailEngine
description: EmailEngine is a self-hosted email automation platform that provides a unified REST API for accessing email accounts
  via IMAP, SMTP, the Gmail API, and the Microsoft Graph API. It exposes JSON payloads, real-time webhooks, OAuth2 integration,
  an IMAP/SMTP proxy, hosted authentication forms, low-code custom integrations, Prometheus monitoring, and bounce detection
  so developers can build modern email functionality without paying per-account fees.
deliveryModel:
  model: unknown
  license_evidence:
    repo: postalsys/emailengine
    spdx: NOASSERTION
    stars: 2229
  open_source: unknown
  commercial: true
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  - pricing
  - repository-unlicensed
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/emailengine.png
type: Index
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: github-pages
tags:
- Email
- Email API
- IMAP
- SMTP
- Webhook
tags_raw:
- Email
- Email API
- IMAP
- SMTP
- Webhooks
url: https://raw.githubusercontent.com/api-evangelist/emailengine/refs/heads/main/apis.yml
created: '2025-02-06'
modified: '2026-05-19'
specificationVersion: '0.23'
access: 3rd-Party
position: Consuming
apis:
- aid: emailengine:emailengine-account-api
  name: EmailEngine Account API
  description: The Account API from EmailEngine — 3 operation(s) for account.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/emailengine-account-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-accounts-api
  name: EmailEngine Accounts API
  description: The Accounts API from EmailEngine — 1 operation(s) for accounts.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/emailengine-accounts-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-autoconfig-api
  name: EmailEngine Autoconfig API
  description: The Autoconfig API from EmailEngine — 1 operation(s) for autoconfig.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Autoconfig
  properties:
  - type: OpenAPI
    url: openapi/emailengine-autoconfig-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-deliverytest-api
  name: EmailEngine Deliverytest API
  description: The Deliverytest API from EmailEngine — 1 operation(s) for deliverytest.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Deliverytest
  properties:
  - type: OpenAPI
    url: openapi/emailengine-deliverytest-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-gateways-api
  name: EmailEngine Gateways API
  description: The Gateways API from EmailEngine — 1 operation(s) for gateways.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Gateways
  properties:
  - type: OpenAPI
    url: openapi/emailengine-gateways-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-license-api
  name: EmailEngine License API
  description: The License API from EmailEngine — 1 operation(s) for license.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - License
  properties:
  - type: OpenAPI
    url: openapi/emailengine-license-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-logs-api
  name: EmailEngine Logs API
  description: The Logs API from EmailEngine — 1 operation(s) for logs.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Logs
  properties:
  - type: OpenAPI
    url: openapi/emailengine-logs-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-outbox-api
  name: EmailEngine Outbox API
  description: The Outbox API from EmailEngine — 1 operation(s) for outbox.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Outbox
  properties:
  - type: OpenAPI
    url: openapi/emailengine-outbox-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-stats-api
  name: EmailEngine Stats API
  description: The Stats API from EmailEngine — 1 operation(s) for stats.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/emailengine-stats-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-templates-api
  name: EmailEngine Templates API
  description: The Templates API from EmailEngine — 1 operation(s) for templates.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/emailengine-templates-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-tokens-api
  name: EmailEngine Tokens API
  description: The Tokens API from EmailEngine — 1 operation(s) for tokens.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Tokens
  properties:
  - type: OpenAPI
    url: openapi/emailengine-tokens-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-webhookroutes-api
  name: EmailEngine Webhookroutes API
  description: The Webhookroutes API from EmailEngine — 1 operation(s) for webhookroutes.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - Webhookroutes
  properties:
  - type: OpenAPI
    url: openapi/emailengine-webhookroutes-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
- aid: emailengine:emailengine-oauth2-api
  name: EmailEngine Oauth2 API
  description: The Oauth2 API from EmailEngine — 1 operation(s) for oauth2.
  humanURL: https://emailengine.app/
  baseURL: https://api.emailengine.app
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - Oauth2
  - Authentication
  properties:
  - type: OpenAPI
    url: openapi/emailengine-oauth2-api-openapi.yml
  - type: Documentation
    url: https://emailengine.app/
  - type: APIReference
    url: https://learn.emailengine.app/docs/api/emailengine-api
  - type: Documentation
    url: https://learn.emailengine.app/
  - type: SourceCode
    url: https://github.com/postalsys/emailengine
  - type: Webhooks
    url: https://emailengine.app/webhooks
common:
- type: Plans
  url: plans/emailengine-plans-pricing.yml
- type: RateLimits
  url: rate-limits/emailengine-rate-limits.yml
- type: FinOps
  url: finops/emailengine-finops.yml
- type: Website
  url: https://www.emailengine.app/
- type: Releases
  url: https://github.com/postalsys/emailengine/releases
- type: SecurityPolicy
  url: https://github.com/postalsys/emailengine/blob/master/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/postalsys/emailengine/blob/master/.github/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/postalsys/emailengine/blob/master/.github/contributing.md
- type: AgenticAccess
  url: agentic-access/emailengine-agentic-access.yml
- type: DomainSecurity
  url: security/emailengine-domain-security.yml
- name: EmailEngine Documentation
  url: https://learn.emailengine.app/
  type: Documentation
- name: API Reference
  url: https://learn.emailengine.app/docs/api/emailengine-api
  type: APIReference
- name: Webhooks
  url: https://emailengine.app/webhooks
  type: Webhooks
- name: GitHub Repository
  url: https://github.com/postalsys/emailengine
  type: SourceCode
- name: Blog
  url: https://blog.emailengine.app/
  type: Blog
- name: FAQ
  url: https://emailengine.app/#faq
  type: FAQ
- name: Pricing
  url: https://postalsys.com/plans
  type: Pricing
- name: Terms of Service
  url: https://postalsys.com/tos
  type: TermsOfService
- name: Privacy Policy
  url: https://emailengine.app/privacy-policy
  type: PrivacyPolicy
- name: Support
  url: https://emailengine.app/support
  type: Support
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

EmailEngine API — frequently asked questions

Does EmailEngine have an API?

Yes. APIs.io lists 13 APIs from EmailEngine, including EmailEngine Account API, EmailEngine Accounts API and EmailEngine Autoconfig API, and 10 more.

Is there an OpenAPI specification for the EmailEngine API?

Yes. APIs.io indexes 13 OpenAPI specifications for EmailEngine, each linked for download from this page.

How much does the EmailEngine API cost?

APIs.io lists 3 pricing plans for EmailEngine, with each plan's price, limits and inclusions under Pricing on this page.

Is the EmailEngine API ready for AI agents?

EmailEngine has a Kin Score of 26.7 out of 100 (thin) and an Agent Readiness score of 21.0 (agent-aware), scored by API Evangelist on 2026-11-06.

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