MailChannels

MailChannels provides a transactional email service for platforms, multi‑tenant applications, and hosting providers. It offers both SMTP relay and a robust RESTful Email API, along with inbound/outbound spam filtering, reputation management, and abuse isolation. The service is designed to protect sender reputation, detect compromised accounts, and give per‑sender controls, helping developers and hosting companies reliably deliver email without building their own infrastructure.

MailChannels is profiled on the APIs.io network. Tagged areas include Company, Email, API, SMTP, and Platform.

The MailChannels catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

MailChannels’ developer surface includes getting-started guide, authentication, documentation, API reference, support, engineering blog, pricing, and 22 more developer resources.

🌐 Visit website📡 Profile data on GitHub
43.0/100 developing Agent 30/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
0 APIs
CompanyEmailAPISMTPPlatform

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 43.0/100 · developing
Contract Quality 1.8 / 21
Developer Ergonomics 10.9 / 17
Access Clarity 10.7 / 17
Operational Transparency 4.1 / 11
Contract Governance 3.0 / 10
Discoverability 4.1 / 9
Regulatory Posture 4.6 / 15
Agent readiness — 30/100 · agent ready
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 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 8 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 6 / 6
Protected Resource Metadata 5 / 5
Registration Without a Human 6 / 6
Agentic Commerce Well-Known Document 0 / 5
Pagination 5 / 5
Distinct Operations 3 / 3
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/.
Show this score on your site. Kin Score badge preview for MailChannels It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/mailchannels/"><img src="https://apis.io/badge/mailchannels/card.svg" alt="MailChannels on APIs.io — Kin Score by API Evangelist"></a>
Other styles, a README pill and a shields.io endpoint are on the badge page.
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Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
  • 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
  • Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
  • Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
6 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/mailchannels/apis.yml: open an issue on github.com/api-evangelist/mailchannels 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 →

Pricing Plans 1

Published pricing tiers and plan structures.

Mailchannels Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Mailchannels Rate Limits

2 limits

RATE LIMITS

Semantic Vocabularies 1

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

Mailchannels Context

4 classes · 5 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

MailChannels API Rules

10 rules · 9 errors 1 info

SPECTRAL

JSON Schema 4

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

DeleteTxV1WebhookResponse

2 properties

JSON SCHEMA

GetTxV1WebhookPublicKeyResponse

2 properties

JSON SCHEMA

GetTxV1WebhookResponse

1 properties

JSON SCHEMA

PostTxV1WebhookValidateResponse

2 properties

JSON SCHEMA

Security Posture 3

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

Mailchannels Authentication

1 scheme

SECURITY

Mailchannels Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Mailchannels Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted
 DeveloperPortal
DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs
 Packages
Packages
 GitHubOrganization
GitHubOrganization

Access & Security 8

Authentication, authorization, and security posture

Security
Security
 Authentication
Authentication
 SecurityTxt
SecurityTxt
 SecurityTxt
SecurityTxt
 SecurityTxt
SecurityTxt
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Scroll for all 8

Operate 2

Status, limits, changes, and where to get help

Support
Support
 Status
Status

Commercial 4

Pricing, plans, and the legal terms of use

Plans
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 3

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: mailchannels
name: MailChannels
image: https://www.mailchannels.com/wp-content/uploads/2014/04/m-logo.jpg
description: MailChannels provides a transactional email service for platforms, multi‑tenant applications, and hosting providers.
  It offers both SMTP relay and a robust RESTful Email API, along with inbound/outbound spam filtering, reputation management,
  and abuse isolation. The service is designed to protect sender reputation, detect compromised accounts, and give per‑sender
  controls, helping developers and hosting companies reliably deliver email without building their own infrastructure.
url: https://raw.githubusercontent.com/api-evangelist/mailchannels/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-27 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-27'
modified: '2026-10-27'
tags:
- Company
- Email
- API
- SMTP
- Platform
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: GettingStarted
  url: https://docs.mailchannels.com/email-api/curl/quickstart
- type: Plans
  url: plans/mailchannels-plans-pricing.yml
- type: Security
  url: security/mailchannels-vulnerability-disclosure.yml
- type: Authentication
  url: authentication/mailchannels-authentication.yml
- type: Conformance
  url: conformance/mailchannels-conformance.yml
- type: LLMsTxt
  url: llms/mailchannels-llms.txt
- type: AgentCard
  url: a2a/mailchannels-a2a.yml
- type: SecurityTxt
  url: well-known/mailchannels-status-security.txt
- type: SecurityTxt
  url: well-known/mailchannels-security.txt
- type: SecurityTxt
  url: well-known/mailchannels-mailchannels-security.txt
- type: SecurityTxt
  url: well-known/mailchannels-blog-security.txt
- type: WellKnown
  url: well-known/mailchannels-well-known.yml
- type: Hosts
  url: hosts/mailchannels-hosts.yml
- type: Vendors
  url: vendors/mailchannels-vendors.yml
- type: SDKs
  url: packages/mailchannels-packages.yml
- type: Packages
  url: packages/mailchannels-packages.yml
- type: DeveloperPortal
  url: https://api.mailchannels.net/tx/v1
- type: VulnerabilityDisclosure
  url: security/mailchannels-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/mailchannels-domain-security.yml
- type: Website
  url: https://mailchannels.com/
- type: Documentation
  url: https://docs.mailchannels.com/
- type: APIReference
  url: https://docs.mailchannels.com/email-api/overview
- type: Support
  url: https://support.mailchannels.com/hc/en-us/requests/new
- type: Blog
  url: https://blog.mailchannels.com/
- type: GitHubOrganization
  url: https://github.com/mailchannels
- type: Pricing
  url: https://www.mailchannels.com/pricing/
- type: TermsOfService
  url: https://www.mailchannels.com/terms-of-service/
- type: PrivacyPolicy
  url: https://www.mailchannels.com/privacy-policy/
- type: Status
  url: https://status.mailchannels.net/
apis: []
x-submission-probe: 301 (-> https://www.mailchannels.com/) 2026-10-26
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  method: derived
  generated: '2026-10-27'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes developer documentation but serves no machine-readable contract from it
  evidence:
  - url: https://mailchannels.com/
    status: 200
x-enrichment:
  date: '2026-10-27'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

MailChannels API — frequently asked questions

How do I authenticate with the MailChannels API?

MailChannels documents its authentication (1 scheme). The details are profiled on APIs.io as Mailchannels Authentication.

How much does the MailChannels API cost?

APIs.io lists 4 pricing plans for MailChannels, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the MailChannels API ready for AI agents?

MailChannels has a Kin Score of 43.0 out of 100 (developing) and an Agent Readiness score of 30.1 (agent-ready), scored by API Evangelist on 2026-10-31.

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