MailBridgeAPI

MailBridgeAPI provides a programmable email API that connects to SMTP and IMAP mailboxes, offering endpoints to send, receive, search and manage email without exposing mailbox passwords. It supports integrations with Gmail, Microsoft 365, Yahoo, Zoho, Apple iCloud, and custom mail servers, featuring AI-powered auto-reply, mobile app control, and detailed analytics. Developers can quickly test connections via a free trial, and companies gain secure, auditable email handling for critical communications.

MailBridgeAPI publishes 7 API contracts indexed on the APIs.io network, including Activity API, Compliance API, Mailbox API, and 4 more. Tagged areas include Email API, SMTP, IMAP, mailbox integration, and Developer Tools.

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

MailBridgeAPI’s developer surface includes authentication, documentation, pricing, signup flow, and 22 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

43.7/100 developing ▲ 9.0 Agent 31/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 published contract 1 Agent Skills

Email API SMTP IMAPmailbox integrationDeveloper Toolsmailbox monitoring

Kin Score

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

Composite quality — 43.7/100 · developing

Contract Quality 10.4 / 19

Developer Ergonomics 4.9 / 15

Access Clarity 7.0 / 15

Operational Transparency 0.9 / 10

Contract Governance 2.0 / 9

Discoverability 6.3 / 8

Regulatory Posture 4.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 31/100 · agent ready

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 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 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 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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/mailbridgeapi/"><img src="https://apis.io/badge/mailbridgeapi/card.svg" alt="MailBridgeAPI on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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 →
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 →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 32.7 — up to +13.5 composite points Ask about this →
Operational Transparency scores 9.5 — up to +11.8 composite points Ask about this →
Contract Quality scores 55.6 — up to +11.1 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/mailbridgeapi/apis.yml: open an issue on github.com/api-evangelist/mailbridgeapi 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 7

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

MailBridgeAPI Email API

Turn your own mailbox into a secure email API.

MailBridgeAPI Activity API

Search messages and build delivery or usage reporting.

MailBridgeAPI Compliance API

Read unsubscribe information for your own contact workflows.

MailBridgeAPI Mailbox API

Inspect mailbox readiness and operational health.

MailBridgeAPI Receiving API

Read incoming messages from the mailbox or the normalized received-message API.

MailBridgeAPI Sending API

Send and validate email through the selected mailbox.

MailBridgeAPI Service API

Public service availability.

Scroll for all 7

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

mailbridgeapi-send-email

AGENT SKILL

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

MailBridgeAPI

7 quoted statements, read from MailBridgeAPI's own page on 2026-11-10.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

MailBridgeAPI

13 quoted statements, read from MailBridgeAPI's own page on 2026-11-10.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

MailBridgeAPI

1 quoted statement, read from MailBridgeAPI's own page on 2026-11-10.

ELIGIBILITY

Semantic Vocabularies 1

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

Mailbridgeapi Context

11 classes · 52 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.

MailBridgeAPI API Rules

14 rules · 12 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 3

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

MailBridgeAPI Authentication

apiKey · 4 schemes

SECURITY

MailBridgeAPI Domain Security

TLSv1.3 · DMARC

SECURITY

MailBridgeAPI Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

MailBridgeAPI Agentic Access

12 operations · 1 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 5

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

DataProcessing

DataProcessing

Eligibility

Eligibility

Source (apis.yml)

aid: mailbridgeapi
name: MailBridgeAPI
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://mailbridgeapi.com/og.png
description: MailBridgeAPI provides a programmable email API that connects to SMTP and IMAP mailboxes, offering endpoints
  to send, receive, search and manage email without exposing mailbox passwords. It supports integrations with Gmail, Microsoft
  365, Yahoo, Zoho, Apple iCloud, and custom mail servers, featuring AI-powered auto-reply, mobile app control, and detailed
  analytics. Developers can quickly test connections via a free trial, and companies gain secure, auditable email handling
  for critical communications.
url: https://raw.githubusercontent.com/api-evangelist/mailbridgeapi/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-21 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-21'
modified: '2026-10-21'
tags:
- Email API
- SMTP
- IMAP
- mailbox integration
- Developer Tools
- mailbox monitoring
tags_raw:
- email API
- SMTP
- IMAP
- mailbox integration
- developer tools
- mailbox monitoring
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/mailbridgeapi-agentic-access.yml
- type: Spectral
  url: rules/mailbridgeapi-rules.yml
- type: JSONLD
  url: json-ld/mailbridgeapi-context.jsonld
- type: Vocabulary
  url: vocabulary/mailbridgeapi-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/mailbridgeapi-data-model.yml
- type: Security
  url: https://mailbridgeapi.com/vulnerability-reporting/
- type: ErrorCatalog
  url: errors/mailbridgeapi-problem-types.yml
- type: Conformance
  url: conformance/mailbridgeapi-conformance.yml
- type: LLMsTxt
  url: llms/mailbridgeapi-llms.txt
- type: SecurityTxt
  url: well-known/mailbridgeapi-security.txt
- type: WellKnown
  url: well-known/mailbridgeapi-well-known.yml
- type: Hosts
  url: hosts/mailbridgeapi-hosts.yml
- type: Authentication
  url: authentication/mailbridgeapi-authentication.yml
- type: VulnerabilityDisclosure
  url: security/mailbridgeapi-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/mailbridgeapi-domain-security.yml
- type: Website
  url: https://mailbridgeapi.com/
- type: Documentation
  url: https://mailbridgeapi.com/doc/
- type: DeveloperPortal
  url: https://mailbridgeapi.com/
- type: Pricing
  url: https://mailbridgeapi.com/pricing/
- type: SignUp
  url: https://mailbridgeapi.com/signup/
- type: TermsOfService
  url: https://mailbridgeapi.com/terms-and-conditions-of-sale/
- type: PrivacyPolicy
  url: https://mailbridgeapi.com/privacy-policy/
- type: UsageTerms
  url: terms/mailbridgeapi-terms-of-service.yml
- type: DataProcessing
  url: privacy/mailbridgeapi-privacy-policy.yml
- type: Eligibility
  url: eligibility/mailbridgeapi-eligibility.yml
apis:
- name: MailBridgeAPI Email API
  description: Turn your own mailbox into a secure email API.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  aid: mailbridgeapi:mailbridgeapi-email-api
- aid: mailbridgeapi:mailbridgeapi-activity-api
  name: MailBridgeAPI Activity API
  description: Search messages and build delivery or usage reporting.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Activity
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-activity-api-openapi.yml
- aid: mailbridgeapi:mailbridgeapi-compliance-api
  name: MailBridgeAPI Compliance API
  description: Read unsubscribe information for your own contact workflows.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Compliance
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-compliance-api-openapi.yml
- aid: mailbridgeapi:mailbridgeapi-mailbox-api
  name: MailBridgeAPI Mailbox API
  description: Inspect mailbox readiness and operational health.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Mailbox
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-mailbox-api-openapi.yml
- aid: mailbridgeapi:mailbridgeapi-receiving-api
  name: MailBridgeAPI Receiving API
  description: Read incoming messages from the mailbox or the normalized received-message API.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Receiving
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-receiving-api-openapi.yml
- aid: mailbridgeapi:mailbridgeapi-sending-api
  name: MailBridgeAPI Sending API
  description: Send and validate email through the selected mailbox.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Sending
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-sending-api-openapi.yml
- aid: mailbridgeapi:mailbridgeapi-service-api
  name: MailBridgeAPI Service API
  description: Public service availability.
  humanURL: https://mailbridgeapi.com/doc/
  baseURL: https://api.mailbridgeapi.com/
  tags:
  - Services
  tags_raw:
  - Service
  properties:
  - type: OpenAPI
    url: openapi/mailbridgeapi-service-api-openapi.yml
x-submission-notes: OpenAPI 3.1 https://api.mailbridgeapi.com/openapi.json 200; Postman; GitHub
x-submission-probe: root 200, docs 200, openapi 200 JSON 38KB
x-enrichment:
  date: '2026-10-21'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

MailBridgeAPI — frequently asked questions

Does MailBridgeAPI have an API?

Yes. APIs.io lists 7 APIs from MailBridgeAPI, including MailBridgeAPI Email API, MailBridgeAPI Activity API and MailBridgeAPI Compliance API, and 4 more.

Is there an OpenAPI specification for the MailBridgeAPI?

Yes. APIs.io indexes 6 OpenAPI specifications for MailBridgeAPI, each linked for download from this page.

How do I authenticate with the MailBridgeAPI?

MailBridgeAPI uses bearer-token authentication (apiKey · 4 schemes). The details are profiled on APIs.io as MailBridgeAPI Authentication.

Is the MailBridgeAPI ready for AI agents?

MailBridgeAPI has a Kin Score of 43.7 out of 100 (developing) and an Agent Readiness score of 30.5 (agent-ready), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/mailbridgeapi"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/mailbridgeapi/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/mailbridgeapi/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.