SMTP2GO website screenshot

SMTP2GO

Email delivery platform with a REST API for sending transactional emails, managing SMTP accounts, tracking delivery, viewing email statistics, and suppressing addresses.

SMTP2GO publishes 11 APIs on the APIs.io network, including Email API, Activity API, API Keys API, and 8 more. Tagged areas include Email, Email Delivery, Transactional Email, SMTP, and SMS.

The SMTP2GO catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

SMTP2GO’s developer surface includes authentication, documentation, API reference, engineering blog, pricing, support, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
49.1/100 developing ▼ -8.4 Agent 38/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
11 APIs
EmailEmail DeliveryTransactional EmailSMTPSMSEmail APIDeliverability

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 49.1/100 · developing
Contract Quality 16.8 / 25
Developer Ergonomics 6.5 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 6.8 / 13
Governance 7.0 / 12
Discoverability 6.5 / 10
Agent readiness — 38/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 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 0 / 8
Dry-Run / Simulate Mode 0 / 4
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/smtp2go: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 11

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

SMTP2GO Email API

REST API for sending transactional emails and SMS, managing sender domains, SMTP users, API keys, templates, webhooks, suppressions, and accessing delivery reports and activity ...

SMTP2GO Activity API

Email activity search

SMTP2GO API Keys API

API key management

SMTP2GO Domains API

Sender domain management

SMTP2GO SMS API

Send and receive SMS messages

SMTP2GO SMTP Users API

SMTP user account management

SMTP2GO Stats API

Email delivery statistics and reports

SMTP2GO Subaccounts API

Subaccount management

SMTP2GO Suppressions API

Suppression list management

SMTP2GO Templates API

Email template management

SMTP2GO Webhooks API

Webhook configuration

Scroll for all 11

Pricing Plans 1

Published pricing tiers and plan structures.

Smtp2Go Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Smtp2Go Rate Limits

8 limits

RATE LIMITS

FinOps 1

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

Smtp2Go Finops

FINOPS

Semantic Vocabularies 1

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

Smtp2Go Context

9 classes · 66 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

SMTP2GO API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 2

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

SMTP2GO Send Email Request

15 properties

JSON SCHEMA

SMTP2GO Suppression

6 properties

JSON SCHEMA

Examples 3

Example request and response payloads for these APIs.

Add Suppression Example

4 fields

EXAMPLE

Send Email Example

4 fields

EXAMPLE

Send Sms Example

4 fields

EXAMPLE

Security Posture 2

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

Smtp2Go Authentication

apiKey · 2 schemes

SECURITY

Smtp2Go Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Smtp2Go Agentic Access

52 operations · 52 acting

52 operations · 52 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg
GitHubOrg

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 Plans
Plans
 FinOps
FinOps

Company 3

The organization behind the API

Website
Website
 Blog
Blog
 LinkedIn
LinkedIn

Other 1

Properties that don't map to a standard resource type

X
X

Source (apis.yml)

apis.yml Raw ↑ 
name: SMTP2GO
description: Email delivery platform with a REST API for sending transactional emails, managing SMTP accounts, tracking delivery,
  viewing email statistics, and suppressing addresses.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/smtp2go.png
url: https://raw.githubusercontent.com/api-evangelist/smtp2go/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.19'
aid: smtp2go
type: Index
tags:
- Email
- Email Delivery
- Transactional Email
- SMTP
- SMS
- Email API
- Deliverability
apis:
- name: SMTP2GO Email API
  description: REST API for sending transactional emails and SMS, managing sender domains, SMTP users, API keys, templates,
    webhooks, suppressions, and accessing delivery reports and activity statistics.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Email
  - SMS
  - Transactional Email
  - Deliverability
  - SMTP
  - Webhooks
  - Templates
  properties:
  - type: Documentation
    url: https://developers.smtp2go.com/docs/introduction-guide
  - type: GettingStarted
    url: https://developers.smtp2go.com/docs/getting-started
  - type: Endpoints
    url: https://developers.smtp2go.com/docs/endpoints
  - type: RateLimits
    url: https://developers.smtp2go.com/docs/rate-limiting
  - type: OpenAPI
    url: https://raw.githubusercontent.com/api-evangelist/smtp2go/refs/heads/main/openapi/smtp2go-email-api-openapi.yml
  contact:
  - FN: SMTP2GO Support
    url: https://support.smtp2go.com/
- aid: smtp2go:smtp2go-activity-api
  name: SMTP2GO Activity API
  description: Email activity search
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Activity
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-activity-api-openapi.yml
- aid: smtp2go:smtp2go-api-keys-api
  name: SMTP2GO API Keys API
  description: API key management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-api-keys-api-openapi.yml
- aid: smtp2go:smtp2go-domains-api
  name: SMTP2GO Domains API
  description: Sender domain management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Domains
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-domains-api-openapi.yml
- aid: smtp2go:smtp2go-sms-api
  name: SMTP2GO SMS API
  description: Send and receive SMS messages
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - SMS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-sms-api-openapi.yml
- aid: smtp2go:smtp2go-smtp-users-api
  name: SMTP2GO SMTP Users API
  description: SMTP user account management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - SMTP Users
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-smtp-users-api-openapi.yml
- aid: smtp2go:smtp2go-stats-api
  name: SMTP2GO Stats API
  description: Email delivery statistics and reports
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Stats
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-stats-api-openapi.yml
- aid: smtp2go:smtp2go-subaccounts-api
  name: SMTP2GO Subaccounts API
  description: Subaccount management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Subaccounts
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-subaccounts-api-openapi.yml
- aid: smtp2go:smtp2go-suppressions-api
  name: SMTP2GO Suppressions API
  description: Suppression list management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Suppressions
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-suppressions-api-openapi.yml
- aid: smtp2go:smtp2go-templates-api
  name: SMTP2GO Templates API
  description: Email template management
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Templates
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-templates-api-openapi.yml
- aid: smtp2go:smtp2go-webhooks-api
  name: SMTP2GO Webhooks API
  description: Webhook configuration
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-webhooks-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/smtp2go-agentic-access.yml
- type: DomainSecurity
  url: security/smtp2go-domain-security.yml
- type: Authentication
  url: authentication/smtp2go-authentication.yml
- type: Website
  url: https://www.smtp2go.com/
- type: Documentation
  url: https://developers.smtp2go.com/docs/introduction-guide
- type: APIReference
  url: https://developers.smtp2go.com/reference/general-api-resources
- type: GitHubOrg
  url: https://github.com/smtp2go-oss
- type: Blog
  url: https://www.smtp2go.com/blog/
- type: Pricing
  url: https://www.smtp2go.com/pricing/
- type: StatusPage
  url: https://smtp2gostatus.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/smtp2go
- type: X
  url: https://x.com/smtp2go
- type: Support
  url: https://support.smtp2go.com/
- type: Plans
  url: plans/smtp2go-plans-pricing.yml
- type: RateLimits
  url: rate-limits/smtp2go-rate-limits.yml
- type: FinOps
  url: finops/smtp2go-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com