securessmtp-com

SecureSMTP provides a transactional email API and SMTP service that lets developers send password resets, sign‑in codes, receipts, order updates and other transactional messages. The platform offers a REST API and SMTP integration, DKIM signing, spam checks, analytics, and a dashboard for managing domains, templates, automations and webhooks. Free tier includes 5,000 emails per month with no credit card required, and paid plans add higher volume and advanced features.

securessmtp-com is listed with 2 APIs on the APIs.io network. Tagged areas include Email, Transactional, API, SMTP, and Service.

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

securessmtp-com’s developer surface includes authentication, documentation, API reference, getting-started guide, support, pricing, signup flow, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

57.8/100 strong Agent 39/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

2 APIs

Email TransactionalAPISMTPServiceSecureSMTP

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 57.8/100 · strong

Contract Quality 11.7 / 21

Developer Ergonomics 8.1 / 17

Access Clarity 12.4 / 17

Operational Transparency 3.8 / 11

Contract Governance 7.2 / 10

Discoverability 4.7 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 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 0 / 7

Typed Event Surface 6 / 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

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 55.0 — up to +11.3 composite points
Developer Ergonomics scores 47.6 — up to +10.5 composite points
Operational Transparency scores 34.2 — up to +8.6 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/securessmtp-com/apis.yml: open an issue on github.com/api-evangelist/securessmtp-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 →

APIs 2

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

SecureSMTP API

Transactional email API providing endpoints for sending email, managing domains, templates, webhooks and more.

securessmtp-com API

securessmtp-com API as documented publicly: 21 operations. Contract generated from the documentation by API Evangelist (2026-10-31); not the provider's own document.

Pricing Plans 1

Published pricing tiers and plan structures.

Securessmtp Com Plans Pricing

5 plans

PLANS

Event Specifications 1

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

Securessmtp Com Webhooks

ASYNCAPI

Semantic Vocabularies 1

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

Securessmtp Com Context

30 classes · 78 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

securessmtp-com API Rules

12 rules · 11 errors 1 info

SPECTRAL

JSON Schema 6

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

GetApiV1FormsRenderSlugResponse

8 properties

JSON SCHEMA

GetApiV1MailDomainStatusResponse

7 properties

JSON SCHEMA

GetApiV1TemplatesResponse

7 properties

JSON SCHEMA

GetFormsRenderSlugResponse

8 properties

JSON SCHEMA

GetTemplatesResponse

7 properties

JSON SCHEMA

PostFormsSubmitRequest

19 properties

JSON SCHEMA

Security Posture 2

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

Securessmtp Com Authentication

1 scheme

SECURITY

Securessmtp Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

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 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Webhooks

DataModel

Conformance

Access & Security 3

Authentication, authorization, and security posture

Authentication

Authentication

Security

Security

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

PrivacyPolicy

TermsOfService

Company 3

The organization behind the API

Newsroom

Newsroom

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: securessmtp-com
name: securessmtp-com
description: SecureSMTP provides a transactional email API and SMTP service that lets developers send password resets, sign‑in
  codes, receipts, order updates and other transactional messages. The platform offers a REST API and SMTP integration, DKIM
  signing, spam checks, analytics, and a dashboard for managing domains, templates, automations and webhooks. Free tier includes
  5,000 emails per month with no credit card required, and paid plans add higher volume and advanced features.
url: https://artifacts.apis.io/securessmtp-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Email
- Transactional
- API
- SMTP
- Service
- SecureSMTP
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/securessmtp-com-plans-pricing.yml
- type: Spectral
  url: rules/securessmtp-com-rules.yml
- type: JSONLD
  url: json-ld/securessmtp-com-context.jsonld
- type: Vocabulary
  url: vocabulary/securessmtp-com-vocabulary.yml
- type: Webhooks
  url: asyncapi/securessmtp-com-webhooks.yml
- type: DataModel
  url: data-model/securessmtp-com-data-model.yml
- type: Authentication
  url: authentication/securessmtp-com-authentication.yml
- type: Conformance
  url: conformance/securessmtp-com-conformance.yml
- type: LLMsTxt
  url: llms/securessmtp-com-llms.txt
- type: WellKnown
  url: well-known/securessmtp-com-well-known.yml
- type: Hosts
  url: hosts/securessmtp-com-hosts.yml
- type: Vendors
  url: vendors/securessmtp-com-vendors.yml
- type: Security
  url: https://securessmtp.com/security
- type: Newsroom
  url: https://securessmtp.com/press
- type: DomainSecurity
  url: security/securessmtp-com-domain-security.yml
- type: Website
  url: https://securessmtp.com/
- type: Documentation
  url: https://securessmtp.com/docs
- type: APIReference
  url: https://securessmtp.com/docs/api/send-email
- type: GettingStarted
  url: https://securessmtp.com/docs/guides/quickstart
- type: Support
  url: https://securessmtp.com/support
- type: Pricing
  url: https://securessmtp.com/pricing
- type: SignUp
  url: https://securessmtp.com/signup
- type: PrivacyPolicy
  url: https://securessmtp.com/privacy
- type: TermsOfService
  url: https://securessmtp.com/dpa
- type: StatusPage
  url: https://securessmtp.com/status
- type: Blog
  url: https://securessmtp.com/blog
apis:
- name: SecureSMTP API
  description: Transactional email API providing endpoints for sending email, managing domains, templates, webhooks and more.
  humanURL: https://securessmtp.com/docs/api/send-email
  baseURL: https://securessmtp.com/api/v1
  aid: securessmtp-com:securesmtp-api
- aid: securessmtp-com:securessmtp-com-api
  name: securessmtp-com API
  description: 'securessmtp-com API as documented publicly: 21 operations. Contract generated from the documentation by API
    Evangelist (2026-10-31);

    not the provider''s own document.'
  humanURL: https://securessmtp.com/docs/api/lift-block
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/securessmtp-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/securessmtp-com-post-forms-submit-request-schema.json
  - type: JSONSchema
    url: json-schema/securessmtp-com-get-api-v1-mail-domain-status-response-schema.json
  - type: JSONSchema
    url: json-schema/securessmtp-com-get-api-v1-forms-render-slug-response-schema.json
  - type: JSONSchema
    url: json-schema/securessmtp-com-get-forms-render-slug-response-schema.json
  - type: JSONSchema
    url: json-schema/securessmtp-com-get-templates-response-schema.json
  - type: JSONSchema
    url: json-schema/securessmtp-com-get-api-v1-templates-response-schema.json
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation pages are JavaScript-rendered and no machine‑readable OpenAPI spec was found.
  evidence:
  - url: https://securessmtp.com/docs/api/send-email
    status: 200
  checked: '2026-10-31'
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 26
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

securessmtp-com API — frequently asked questions

Does securessmtp-com have an API?

Yes. APIs.io lists 2 APIs from securessmtp-com, including SecureSMTP API and securessmtp-com API.

Is there an OpenAPI specification for the securessmtp-com API?

Yes. APIs.io indexes 1 OpenAPI specification for securessmtp-com, each linked for download from this page.

How do I authenticate with the securessmtp-com API?

securessmtp-com documents its authentication (1 scheme). The details are profiled on APIs.io as Securessmtp Com Authentication.

How much does the securessmtp-com API cost?

APIs.io lists 5 pricing plans for securessmtp-com, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the securessmtp-com API ready for AI agents?

securessmtp-com has a Kin Score of 57.8 out of 100 (strong) and an Agent Readiness score of 38.6 (agent-ready), scored by API Evangelist on 2026-10-31.

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