SMTP2GO

SMTP2GO is a New Zealand-founded email and SMS delivery platform, running since 2006, that sends and tracks transactional and marketing messages over SMTP relay or a JSON REST API from data centres in the United States, the European Union and Australia. The v3 API covers sending standard, MIME, batch and scheduled email, sending and receiving SMS, verifying sender domains and single sender addresses, managing SMTP users, API keys, IP allow lists and IP authentication, templates, webhooks, suppressions, subaccounts, dedicated IPs and the email archive, plus activity search and delivery statistics. It also ships a remote MCP server and a published Agent Skill for AI agents.

SMTP2GO publishes 18 API contracts indexed on the APIs.io network, including Activity API, API Keys API, SMS API, and 15 more. Tagged areas include Email, Email Delivery, Transactional Email, SMTP, and SMS.

The SMTP2GO catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 1 Spectral governance ruleset.

SMTP2GO’s developer surface includes authentication, documentation, API reference, engineering blog, pricing, support, changelog, and 33 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

73.3/100 exemplar ▬ flat Agent 39/100 agent ready Front door AI 1/6 silent Heartbeat 76/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract 1 MCP Servers 3 Agent Skills

Email Email Delivery Transactional Email SMTP SMS Email API Deliverability Webhook Messaging Communications MCP Agent Skills

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Developer Platform & API Ecosystem Management

BC-4270

WEBHOOKS

POST /webhook/add POST /webhook/remove

What people ask SMTP2GO 18

The questions people put to an LLM, and the jobs they hand an agent, that SMTP2GO's APIs answer — each one linked to the operation that does it. Generated by API Evangelist

SMTP2GO SENDER DOMAINS API Add a sender domain “How do I add my domain so I can send email from it?” Remove a sender domain “How do I delete a sender domain I no longer use?” Change a domain's return-path subdomain “How do I change where bounces are returned for my sender domain?” Share a sender domain with subaccounts “Can my subaccounts send from a domain verified on the master account?”

SMTP2GO STATISTICS API Summarize bounces over the last 30 days “How many of my emails bounced in the last 30 days?” View usage for the current billing cycle “How many emails have I sent so far this billing cycle?” Report email activity by sender or domain “Which sender addresses sent the most email last month?” Summarize spam complaints “How many spam complaints did we get in the last 30 days?”

SMTP2GO API Keys API Create a new API key “How do I create a new SMTP2GO API key?” Replace an API key's settings “How do I update all the settings of an existing API key at once?” Partially update an API key “Can I change just one setting on an API key without resending everything?” List endpoints the current key can call “Which endpoints is the API key I'm using allowed to call?”

SMTP2GO IP Allowlist API Enable or disable an IP allow list “How do I turn on IP allow listing for API access?” Add an IP to an allow list “How do I add a new IP address to my allow list?” Change an allow-listed IP address “How do I change an IP address that's already on my allow list?” Remove an IP from an allow list “How do I remove an IP address from my allow list?”

SMTP2GO SMTP Users API Create an SMTP user “How do I create new SMTP credentials for an application?” Replace an SMTP user's settings “How do I do a full update of an SMTP user's settings?” Partially update an SMTP user “Can I change only one field on an SMTP user and leave the rest alone?” Delete an SMTP user “How do I delete SMTP credentials that are no longer used?”

SMTP2GO EMAILS API Send a batch of emails “Can I send many different emails in a single request?” Send a pre-encoded MIME email “How do I send an email I've already built as a raw MIME string?” Cancel a scheduled email “How do I cancel an email that's scheduled but not yet sent?” Search scheduled emails “Which emails do I have scheduled to go out later?”

SMTP2GO Subaccounts API Create a subaccount “How do I create a subaccount for a client under my master account?” Close a subaccount “How do I shut down a client's subaccount?” Update a subaccount's details “How do I raise the sending limit on a subaccount?” Reopen a closed subaccount “Can I reactivate a subaccount I closed earlier?”

SMTP2GO Templates API Create an email template “How do I create a reusable email template with variables?” Delete an email template “How do I delete an email template I don't use anymore?” Update an email template “How do I change the subject line of an existing template?” Search email templates “Which email templates do I have?”

SMTP2GO ALLOWED RECIPIENTS API Add addresses to the Allowed Recipients List “How do I add a domain to my allowed recipients list?” Remove addresses from the Allowed Recipients List “How can I take a domain off my allowed recipients list?” Replace the Allowed Recipients List “Can I overwrite my whole allowed recipients list with a new set of addresses?” View the Allowed Recipients List “Which addresses and domains are currently on my allowed recipients list?”

SMTP2GO Webhooks API Create a webhook “How do I get notified at my URL when emails bounce or are opened?” Update a webhook “How do I change the URL an existing webhook posts to?” Delete a webhook “How do I stop a webhook from sending events?” List configured webhooks “Which webhooks are configured on my account?”

SMTP2GO SMS API Send an SMS message “How do I send a text message to a group of phone numbers?” Summarize SMS activity for a period “How many SMS messages did we send last month?” View received SMS messages “What inbound text messages have we received?” View sent SMS messages “Which outbound SMS messages have gone out recently?”

SMTP2GO ALLOWED SENDERS API Add addresses to the allowed senders list “How do I add a sender domain to my allowed or restricted senders list?” Remove addresses from the allowed senders list “How can I take a sender address off my allowed senders list?” Replace the senders list and its mode “Can I switch my senders list between whitelist, blacklist and disabled mode?” View the allowed senders list and mode “Which senders are on my allowed senders list and what mode is it in?”

Showing 12 of 18 APIs with phrasing — see every API.

Kin Score

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

Composite quality — 73.3/100 · exemplar

Contract Quality 13.8 / 19

Developer Ergonomics 11.8 / 15

Access Clarity 13.8 / 15

Operational Transparency 7.4 / 10

Contract Governance 2.5 / 9

Discoverability 5.6 / 8

Regulatory Posture 3.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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 6 / 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 Telecommunications 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):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
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)
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified)

4 more unmet checks in the Agent Readiness table above.

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

Contract Governance scores 28.0 — up to +8.6 composite points
Contract Quality scores 73.7 — up to +6.6 composite points
Developer Ergonomics scores 78.6 — up to +4.3 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/smtp2go/apis.yml: open an issue on github.com/api-evangelist/smtp2go 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Communications (CPaaS)	builds-on	19.7 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

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.

Agent Skills

measured — observed by APIs.io (published)

Model Context Protocol (MCP)

measured — observed by APIs.io (platform)

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 18

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

SMTP2GO Activity API

Email activity search

SMTP2GO API Keys API

API key management

SMTP2GO SMS API

Send and receive SMS messages

SMTP2GO SMTP Users API

SMTP user account management

SMTP2GO Subaccounts API

Subaccount management

SMTP2GO Suppressions API

Suppression list management

SMTP2GO Templates API

Email template management

SMTP2GO Webhooks API

Webhook configuration

SMTP2GO ALLOWED RECIPIENTS API

Manage the allowed recipients list

SMTP2GO ALLOWED SENDERS API

Manage the allowed/restricted senders list

SMTP2GO DEDICATED IPS API

View dedicated IP addresses on the account

SMTP2GO EMAIL ARCHIVE API

Search and retrieve archived email content

SMTP2GO EMAILS API

Send standard, MIME and batch email; manage scheduled sends

SMTP2GO IP AUTH API

Manage IP-authenticated sending entries

SMTP2GO SENDER DOMAINS API

Add, verify and manage sender domains, tracking and return-path subdomains

SMTP2GO SINGLE SENDER EMAILS API

Verify individual From addresses

SMTP2GO STATISTICS API

Delivery, bounce, spam, unsubscribe and cycle statistics

SMTP2GO IP Allowlist API

Manage the account IP allow list for SMTP and API access

Scroll for all 18

Open Collections 11

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

SMTP2GO Email Activity API

OPEN COLLECTION

SMTP2GO Email Activity API Keys API

OPEN COLLECTION

SMTP2GO Email Activity Domains API

OPEN COLLECTION

SMTP2GO Activity Email API

OPEN COLLECTION

SMTP2GO Email Activity SMS API

OPEN COLLECTION

SMTP2GO Email Activity SMTP Users API

OPEN COLLECTION

SMTP2GO Email Activity Stats API

OPEN COLLECTION

SMTP2GO Email Activity Subaccounts API

OPEN COLLECTION

SMTP2GO Email Activity Suppressions API

OPEN COLLECTION

SMTP2GO Email Activity Templates API

OPEN COLLECTION

SMTP2GO Email Activity Webhooks API

OPEN COLLECTION

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MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

SMTP2GO remote MCP server

Remote MCP server at developers.smtp2go.com over streamable HTTP requiring an API key; 5 tools listed.

MCP SERVER

Agent Skills 3

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

smtp2go-send-email

AGENT SKILL

smtp2go-verify-sender-domain

AGENT SKILL

smtp2go-webhook-and-reconcile

AGENT SKILL

SMTP2GO API pricing

Prices published by SMTP2GO, read 2026-10-28 from www.smtp2go.com/pricing/.

Plan	Price
Free	Sign Up Free Includes: up to 1,000 emails per month
Starter	$10/mo Includes: 10,000 emails/mo
Professional	$75/mo Includes: 100,000 emails/mo
Premier	Premier Custom Includes: Over 3,000,000 emails/mo

Plan details, limits and sources →

Rate limits

: 60
: 5
: 50

All 9 limits →

Billed by: emails/mo · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Smtp2Go Plans Pricing

4 plans

PLANS

Smtp2Go Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Smtp2Go Rate Limits

9 limits

RATE LIMITS

Service Levels 1

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

SMTP2GO

SLA

FinOps 1

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

Smtp2Go Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Smtp2Go Webhooks

ASYNCAPI

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 — jsonschema rules

5 rules · 4 warnings 1 info

SPECTRAL

OpenAPI Overlays 19

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Smtp2Go Activity Api Phrasing Overlay

2 actions · phrasing · smtp2go-activity-api-openapi.yml

GENERATED

Smtp2Go Allowed Recipients Api Phrasing Overlay

5 actions · phrasing · smtp2go-allowed-recipients-api-openapi.yml

GENERATED

Smtp2Go Allowed Senders Api Phrasing Overlay

5 actions · phrasing · smtp2go-allowed-senders-api-openapi.yml

GENERATED

Smtp2Go Api Keys Api Phrasing Overlay

7 actions · phrasing · smtp2go-api-keys-api-openapi.yml

GENERATED

Smtp2Go Api Overlay

10 actions · update · smtp2go-openapi-original.yml

DERIVED

Smtp2Go Dedicated Ips Api Phrasing Overlay

2 actions · phrasing · smtp2go-dedicated-ips-api-openapi.yml

GENERATED

Smtp2Go Email Archive Api Phrasing Overlay

3 actions · phrasing · smtp2go-email-archive-api-openapi.yml

GENERATED

Smtp2Go Emails Api Phrasing Overlay

6 actions · phrasing · smtp2go-emails-api-openapi.yml

GENERATED

Smtp2Go Ip Allowlist Api Phrasing Overlay

6 actions · phrasing · smtp2go-ip-allowlist-api-openapi.yml

GENERATED

Smtp2Go Ip Auth Api Phrasing Overlay

4 actions · phrasing · smtp2go-ip-auth-api-openapi.yml

GENERATED

Smtp2Go Sender Domains Api Phrasing Overlay

8 actions · phrasing · smtp2go-sender-domains-api-openapi.yml

GENERATED

Smtp2Go Single Sender Emails Api Phrasing Overlay

4 actions · phrasing · smtp2go-single-sender-emails-api-openapi.yml

GENERATED

Smtp2Go Sms Api Phrasing Overlay

5 actions · phrasing · smtp2go-sms-api-openapi.yml

GENERATED

Smtp2Go Smtp Users Api Phrasing Overlay

6 actions · phrasing · smtp2go-smtp-users-api-openapi.yml

GENERATED

Smtp2Go Statistics Api Phrasing Overlay

7 actions · phrasing · smtp2go-statistics-api-openapi.yml

GENERATED

Smtp2Go Subaccounts Api Phrasing Overlay

6 actions · phrasing · smtp2go-subaccounts-api-openapi.yml

GENERATED

Smtp2Go Suppressions Api Phrasing Overlay

4 actions · phrasing · smtp2go-suppressions-api-openapi.yml

GENERATED

Smtp2Go Templates Api Phrasing Overlay

6 actions · phrasing · smtp2go-templates-api-openapi.yml

GENERATED

Smtp2Go Webhooks Api Phrasing Overlay

5 actions · phrasing · smtp2go-webhooks-api-openapi.yml

GENERATED

Scroll for all 19

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

73 operations · 68 acting

AGENTIC

Resources

Get Started 5

Portal, sign-up, and the first successful call

Sandbox

DeveloperPortal

GettingStarted

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

AgentSkill

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

Webhooks

DataModel

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrg

Packages

SDKs

ToolCrosswalk

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Compliance

Compliance

Operate 5

Status, limits, changes, and where to get help

StatusPage

Support

RateLimits

ChangeLog

ChangeLog

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

Plans

FinOps

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

Source (apis.yml)

name: SMTP2GO
description: SMTP2GO is a New Zealand-founded email and SMS delivery platform, running since 2006, that sends and tracks transactional
  and marketing messages over SMTP relay or a JSON REST API from data centres in the United States, the European Union and
  Australia. The v3 API covers sending standard, MIME, batch and scheduled email, sending and receiving SMS, verifying sender
  domains and single sender addresses, managing SMTP users, API keys, IP allow lists and IP authentication, templates, webhooks,
  suppressions, subaccounts, dedicated IPs and the email archive, plus activity search and delivery statistics. It also ships
  a remote MCP server and a published Agent Skill for AI agents.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-06'
  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: '2026-08-13'
specificationVersion: '0.23'
aid: smtp2go
type: Index
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Email
- Email Delivery
- Transactional Email
- SMTP
- SMS
- Email API
- Deliverability
- Webhook
- Messaging
- Communications
- MCP
- Agent Skills
tags_raw:
- Email
- Email Delivery
- Transactional Email
- SMTP
- SMS
- Email API
- Deliverability
- Webhooks
- Messaging
- Communications
- MCP
- Agent Skills
apis:
- 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:
  - APIKeys
  tags_raw:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-api-keys-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-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:
  - Webhook
  tags_raw:
  - Webhooks
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-webhooks-api-openapi.yml
- aid: smtp2go:smtp2go-allowed-recipients-api
  name: SMTP2GO ALLOWED RECIPIENTS API
  description: Manage the allowed recipients list
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - ALLOWED RECIPIENTS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-allowed-recipients-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-allowed-senders-api
  name: SMTP2GO ALLOWED SENDERS API
  description: Manage the allowed/restricted senders list
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - ALLOWED SENDERS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-allowed-senders-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-dedicated-ips-api
  name: SMTP2GO DEDICATED IPS API
  description: View dedicated IP addresses on the account
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - DEDICATED IPS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-dedicated-ips-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-email-archive-api
  name: SMTP2GO EMAIL ARCHIVE API
  description: Search and retrieve archived email content
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - EMAIL ARCHIVE
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-email-archive-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-emails-api
  name: SMTP2GO EMAILS API
  description: Send standard, MIME and batch email; manage scheduled sends
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Email
  tags_raw:
  - EMAILS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-emails-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-ip-auth-api
  name: SMTP2GO IP AUTH API
  description: Manage IP-authenticated sending entries
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - IP AUTH
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-ip-auth-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-sender-domains-api
  name: SMTP2GO SENDER DOMAINS API
  description: Add, verify and manage sender domains, tracking and return-path subdomains
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - SENDER DOMAINS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-sender-domains-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-single-sender-emails-api
  name: SMTP2GO SINGLE SENDER EMAILS API
  description: Verify individual From addresses
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - SINGLE SENDER EMAILS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-single-sender-emails-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-statistics-api
  name: SMTP2GO STATISTICS API
  description: Delivery, bounce, spam, unsubscribe and cycle statistics
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - Statistics
  tags_raw:
  - STATISTICS
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-statistics-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
- aid: smtp2go:smtp2go-ip-allowlist-api
  name: SMTP2GO IP Allowlist API
  description: Manage the account IP allow list for SMTP and API access
  humanURL: https://developers.smtp2go.com/docs/introduction-guide
  baseURL: https://api.smtp2go.com/v3
  tags:
  - IP Allowlist
  properties:
  - type: OpenAPI
    url: openapi/smtp2go-ip-allowlist-api-openapi.yml
  - 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: APIReference
    url: https://developers.smtp2go.com/reference/general-api-resources
common:
- type: CapabilityMap
  url: capabilities/smtp2go-capability-edges.yml
  name: SMTP2GO Business Capability Map
- 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
- type: Packages
  name: SMTP2GO client libraries
  url: packages/smtp2go-packages.yml
- type: SDKs
  name: SMTP2GO official SDKs
  url: packages/smtp2go-packages.yml
- type: MCPServer
  name: SMTP2GO remote MCP server
  url: mcp/smtp2go-mcp.yml
- type: ToolCrosswalk
  name: SMTP2GO MCP tool to REST operation crosswalk
  url: mcp/smtp2go-tool-crosswalk.yml
- type: AgentSkill
  name: SMTP2GO Agent Skills
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/smtp2go-llms.txt
- type: Overlay
  url: overlays/smtp2go-api-overlay.yaml
- type: Conventions
  url: conventions/smtp2go-conventions.yml
- type: ErrorCatalog
  url: errors/smtp2go-problem-types.yml
- type: Lifecycle
  url: lifecycle/smtp2go-lifecycle.yml
- type: ChangeLog
  url: changelog/smtp2go-changelog.yml
- type: ChangeLog
  name: SMTP2GO API changelog
  url: https://developers.smtp2go.com/reference/changelog
- type: Conformance
  url: conformance/smtp2go-conformance.yml
- type: Compliance
  name: Security and Privacy at SMTP2GO
  url: https://www.smtp2go.com/blog/security-and-privacy-at-smtp2go/
- type: Webhooks
  name: SMTP2GO webhook event surface
  url: asyncapi/smtp2go-webhooks.yml
- type: Sandbox
  name: SMTP2GO Sandbox Mode
  url: sandbox/smtp2go-sandbox.yml
- type: DataModel
  url: data-model/smtp2go-data-model.yml
- type: DeveloperPortal
  url: https://developers.smtp2go.com/
- type: GettingStarted
  url: https://developers.smtp2go.com/docs/getting-started
- type: SignUp
  url: https://www.smtp2go.com/pricing/signup/
- type: Login
  url: https://app.smtp2go.com/login/
- type: TermsOfService
  url: https://www.smtp2go.com/terms/
- type: PrivacyPolicy
  url: https://www.smtp2go.com/privacy/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 21
  pass: local-v1

SMTP2GO API — frequently asked questions

Does SMTP2GO have an API?

Yes. APIs.io lists 18 APIs from SMTP2GO, including SMTP2GO Activity API, SMTP2GO API Keys API and SMTP2GO SMS API, and 15 more.

Is there an OpenAPI specification for the SMTP2GO API?

Yes. APIs.io indexes 18 OpenAPI specifications for SMTP2GO, each linked for download from this page.

How do I authenticate with the SMTP2GO API?

SMTP2GO uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Smtp2Go Authentication.

How much does the SMTP2GO API cost?

SMTP2GO publishes its prices; its Free plan is Sign Up Free as of 2026-10-28. APIs.io lists 4 pricing plans for SMTP2GO, with each plan's price, limits and inclusions under Pricing on this page.

Does SMTP2GO have an MCP server?

Yes. APIs.io lists 1 MCP server for SMTP2GO: Remote MCP server at developers.smtp2go.com over streamable HTTP requiring an API key; 5 tools listed.

Is the SMTP2GO API ready for AI agents?

SMTP2GO has a Kin Score of 73.3 out of 100 (exemplar) and an Agent Readiness score of 39.1 (agent-ready), scored by API Evangelist on 2026-11-06.

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