# Mailosaur

**Canonical:** https://apis.io/providers/mailosaur/  
**Website:** https://mailosaur.com  
**APIs profiled:** 7

Mailosaur is an email and SMS testing platform for developers and QA teams. It provides a REST API for creating test inboxes, capturing and retrieving messages, running assertions, performing deliverability analysis, and integrating email and SMS testing into CI/CD pipelines. The platform supports authentication testing (TOTP/2FA), spam analysis, SPF/DKIM/DMARC validation, and connects via SMTP, POP3, and IMAP protocols.

## Kin Score — 70.8 / 100 (exemplar)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 70.8).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 63.6 |
| Governance | 43.9 |
| Contract Governance | 43.9 |
| Operational Transparency | 52.6 |
| Developer Ergonomics | 73.2 |
| Commercial Clarity | 100.0 |
| Access Clarity | 100.0 |

## Agent readiness — 35.0 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | documented |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Paid (free trial) · Self-serve signup — onboarding: self-serve, pricing: paid, trial: yes (confidence: high).

## APIs (7)

- **Mailosaur Analysis API** — Operations for analyzing the content and deliverability of an email, including SpamAssassin scoring and per-provider deliverability reports.
- **Mailosaur Devices API** — Operations for managing virtual security devices and retrieving their current one-time passwords (OTPs), used to automate testing of app-based multi-factor authentication.
- **Mailosaur Files API** — Operations for downloading the raw content associated with a message — file attachments, the full EML source of an email, and rendered email previews.
- **Mailosaur Messages API** — Operations for finding, retrieving, creating, forwarding, replying to, and deleting the email and SMS messages received by your Mailosaur inboxes.
- **Mailosaur Previews API** — Operations for discovering the email clients available for generating email previews (screenshots of an email rendered in real clients).
- **Mailosaur Servers API** — Operations for creating and managing your Mailosaur inboxes (servers). Inboxes group your tests together, each with its own domain and SMTP/POP3/IMAP credentials.
- **Mailosaur Usage API** — Operations for inspecting your account's usage limits and recent transactional usage. These endpoints require authentication with an account-level API key.

## MCP servers (1)

- **Mailosaur MCP Server**

## Agentic access (1)

- **Mailosaur Agentic Access** — 28 operations · 13 acting

## Security (3)

- **Mailosaur Authentication** — http · 1 scheme
- **Mailosaur Domain Security** — TLSv1.3 · HSTS · DMARC
- **Mailosaur Trust Center** — ISO 27001:2022, PCI DSS, GDPR, UK Data Protection Act, CCPA

## Plans (1)

- **Mailosaur Plans Pricing**

## Tags

Email Testing, SMS Testing, Developer Tools, QA Automation, CI/CD, SMTP, TOTP, Deliverability

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/mailosaur/). Scores are computed from the provider's own public artifacts under a published rubric.