Free Email Spam Tester

Free Email Spam Tester is a free, independent email deliverability testing tool built by Serhii Tanichev in 2026. It offers a disposable test address, runs 42 checks (SPF, DKIM, DMARC, ARC, DNS, reputation, inbox placement) and provides detailed RFC‑referenced reports. No signup or credit card required; integrates with Mailchimp, HubSpot, SendGrid, Zapier, n8n, GitHub Actions and AI assistants.

Free Email Spam Tester publishes 7 API contracts indexed on the APIs.io network, including Free DNS tools API, Health API, Inbox API, and 4 more. Tagged areas include Email, Deliverability, Spam, Testing, and Free.

The Free Email Spam Tester catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Free Email Spam Tester’s developer surface includes changelog, documentation, engineering blog, API reference, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

40.1/100 developing Agent 25/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumOpen⚡ Free to try

1 published contract

Email Deliverability Spam Testing Free

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 40.1/100 · developing

Contract Quality 11.7 / 21

Developer Ergonomics 5.5 / 17

Access Clarity 7.2 / 17

Operational Transparency 2.1 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.9 / 15

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 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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 0 / 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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
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) Ask about this →
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) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →

10 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 32.6 — up to +13.5 composite points Ask about this →
Access Clarity scores 42.6 — up to +11.5 composite points Ask about this →
Contract Quality scores 55.0 — up to +11.3 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/email-spam-tester-com/apis.yml: open an issue on github.com/api-evangelist/email-spam-tester-com 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 1

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)

APIs 7

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

Free Email Spam Tester Free DNS tools API

The Free DNS tools API from Free Email Spam Tester — 15 operation(s) for free dns tools.

Free Email Spam Tester Health API

The Health API from Free Email Spam Tester — 2 operation(s) for health.

Free Email Spam Tester Inbox API

The Inbox API from Free Email Spam Tester — 1 operation(s) for inbox.

Free Email Spam Tester Inbox placement API

The Inbox placement API from Free Email Spam Tester — 4 operation(s) for inbox placement.

Free Email Spam Tester Infra checks API

The Infra checks API from Free Email Spam Tester — 5 operation(s) for infra checks.

Free Email Spam Tester Keys API

The Keys API from Free Email Spam Tester — 2 operation(s) for keys.

Free Email Spam Tester Tests API

The Tests API from Free Email Spam Tester — 4 operation(s) for tests.

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Free Email Spam Tester API pricing

Prices published by Free Email Spam Tester, read 2026-11-06 from github.com/pricing.

Plan	Price
Free	$0 USD
Team	$4 USD per user/ month
Enterprise	$21 USD per user/ month

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Free Email Spam Tester Plans Pricing

3 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Email Spam Tester Com Context

74 classes · 270 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Free Email Spam Tester API Rules

46 rules · 37 error-severity 5 warn-severity 4 info-severity

SPECTRAL

JSON Schema 11

Standalone JSON Schema definitions for this provider's data models.

BimiOut

14 properties

JSON SCHEMA

CreatePlacement

3 properties

JSON SCHEMA

DmarcOut

11 properties

JSON SCHEMA

InboxResponse

3 properties

JSON SCHEMA

InfraOut

17 properties

JSON SCHEMA

KeyIn

1 properties

JSON SCHEMA

KeyOut

2 properties

JSON SCHEMA

HeaderOut

18 properties

JSON SCHEMA

MeOut

3 properties

JSON SCHEMA

MxOut

12 properties

JSON SCHEMA

ReportOut

20 properties

JSON SCHEMA

Scroll for all 11

Security Posture 1

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

Free Email Spam Tester Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Free Email Spam Tester Agentic Access

33 operations · 5 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgentSkill

AgentSkill

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: email-spam-tester-com
name: Free Email Spam Tester
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Open access
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://email-spam-tester.com/og.png?v=090278a1df2b
description: Free Email Spam Tester is a free, independent email deliverability testing tool built by Serhii Tanichev in 2026.
  It offers a disposable test address, runs 42 checks (SPF, DKIM, DMARC, ARC, DNS, reputation, inbox placement) and provides
  detailed RFC‑referenced reports. No signup or credit card required; integrates with Mailchimp, HubSpot, SendGrid, Zapier,
  n8n, GitHub Actions and AI assistants.
url: https://artifacts.apis.io/email-spam-tester-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-06 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-06'
modified: '2026-11-06'
tags:
- Email
- Deliverability
- Spam
- Testing
- Free
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgentSkill
  url: skills/_index.yml
- type: AgenticAccess
  url: agentic-access/email-spam-tester-com-agentic-access.yml
- type: Plans
  url: plans/email-spam-tester-com-plans-pricing.yml
- type: Spectral
  url: rules/email-spam-tester-com-rules.yml
- type: JSONLD
  url: json-ld/email-spam-tester-com-context.jsonld
- type: Vocabulary
  url: vocabulary/email-spam-tester-com-vocabulary.yml
- type: DataModel
  url: data-model/email-spam-tester-com-data-model.yml
- type: ChangeLog
  url: changelog/email-spam-tester-com-changelog.yml
- type: ErrorCatalog
  url: errors/email-spam-tester-com-problem-types.yml
- type: Conformance
  url: conformance/email-spam-tester-com-conformance.yml
- type: LLMsTxt
  url: llms/email-spam-tester-com-llms.txt
- type: Hosts
  url: hosts/email-spam-tester-com-hosts.yml
- type: Vendors
  url: vendors/email-spam-tester-com-vendors.yml
- type: SDKs
  url: packages/email-spam-tester-com-packages.yml
- type: Packages
  url: packages/email-spam-tester-com-packages.yml
- type: TermsOfService
  url: https://email-spam-tester.com/terms/
- type: PrivacyPolicy
  url: https://email-spam-tester.com/privacy/
- type: GitHubOrganization
  url: https://github.com/serg-tanichev
- type: Documentation
  url: https://email-spam-tester.com/docs/
- type: ChangeLog
  url: https://email-spam-tester.com/changelog/
- type: Blog
  url: https://email-spam-tester.com/blog/
- type: APIReference
  url: https://email-spam-tester.com/llms.txt
- type: DomainSecurity
  url: security/email-spam-tester-com-domain-security.yml
- type: Website
  url: https://email-spam-tester.com/
apis:
- aid: email-spam-tester-com:email-spam-tester-com-free-dns-tools-api
  name: Free Email Spam Tester Free DNS tools API
  description: The Free DNS tools API from Free Email Spam Tester — 15 operation(s) for free dns tools.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Free DNS tools
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-free-dns-tools-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-mailtester-api-tools-header-out-schema.json
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-bimi-out-schema.json
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-dmarc-out-schema.json
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-mx-out-schema.json
- aid: email-spam-tester-com:email-spam-tester-com-health-api
  name: Free Email Spam Tester Health API
  description: The Health API from Free Email Spam Tester — 2 operation(s) for health.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-health-api-openapi.yml
- aid: email-spam-tester-com:email-spam-tester-com-inbox-api
  name: Free Email Spam Tester Inbox API
  description: The Inbox API from Free Email Spam Tester — 1 operation(s) for inbox.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Inbox
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-inbox-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-inbox-response-schema.json
- aid: email-spam-tester-com:email-spam-tester-com-inbox-placement-api
  name: Free Email Spam Tester Inbox placement API
  description: The Inbox placement API from Free Email Spam Tester — 4 operation(s) for inbox placement.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Inbox Placement
  tags_raw:
  - Inbox placement
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-inbox-placement-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-create-placement-schema.json
- aid: email-spam-tester-com:email-spam-tester-com-infra-checks-api
  name: Free Email Spam Tester Infra checks API
  description: The Infra checks API from Free Email Spam Tester — 5 operation(s) for infra checks.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Infra checks
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-infra-checks-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-infra-out-schema.json
- aid: email-spam-tester-com:email-spam-tester-com-keys-api
  name: Free Email Spam Tester Keys API
  description: The Keys API from Free Email Spam Tester — 2 operation(s) for keys.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-me-out-schema.json
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-key-in-schema.json
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-key-out-schema.json
- aid: email-spam-tester-com:email-spam-tester-com-tests-api
  name: Free Email Spam Tester Tests API
  description: The Tests API from Free Email Spam Tester — 4 operation(s) for tests.
  humanURL: https://email-spam-tester.com/docs
  baseURL: https://email-spam-tester.com/api
  tags:
  - Tests
  properties:
  - type: OpenAPI
    url: openapi/email-spam-tester-com-tests-api-openapi.yml
  - type: JSONSchema
    url: json-schema/email-spam-tester-com-report-out-schema.json
x-enrichment:
  date: '2026-11-06'
  status: enriched
  artifacts_added: 29
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Free Email Spam Tester API — frequently asked questions

Does Free Email Spam Tester have an API?

Yes. APIs.io lists 7 APIs from Free Email Spam Tester, including Free Email Spam Tester Free DNS tools API, Free Email Spam Tester Health API and Free Email Spam Tester Inbox API, and 4 more.

Is there an OpenAPI specification for the Free Email Spam Tester API?

Yes. APIs.io indexes 7 OpenAPI specifications for Free Email Spam Tester, each linked for download from this page.

How much does the Free Email Spam Tester API cost?

Free Email Spam Tester publishes its prices; its Free plan is $0 USD as of 2026-11-06. APIs.io lists 3 pricing plans for Free Email Spam Tester, with each plan's price, limits and inclusions under Pricing on this page.

Is the Free Email Spam Tester API ready for AI agents?

Free Email Spam Tester has a Kin Score of 40.1 out of 100 (developing) and an Agent Readiness score of 24.5 (agent-aware), scored by API Evangelist on 2026-11-13.

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