# Fastmail

**Canonical:** https://apis.io/providers/fastmail/  
**Website:** https://www.fastmail.com  
**APIs profiled:** 1

Fastmail provides secure, private email and calendar services for individuals and businesses. Founded in 1999, Fastmail emphasizes data protection, user privacy, and a feature‑rich experience with powerful filtering, custom domains, and cross‑platform synchronization. Their service includes robust spam protection, two‑factor authentication, and a focus on delivering a fast, reliable email platform without advertising or data mining. Fastmail also offers business plans with administrative controls, migration tools, and dedicated support, catering to professionals who need secure communication and reliable uptime.

## Kin Score — 28.8 / 100 (thin)

Scored 2026-11-06 under rubric 0.27.0. Trend: falling (-9.3 from 38.1).

| Facet | Score |
|---|---|
| Discoverability | 57.1 |
| Contract Quality | 0.0 |
| Contract Governance | 18.2 |
| Operational Transparency | 28.9 |
| Developer Ergonomics | 29.8 |
| Access Clarity | 47.4 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 26.5 (matched via fallback).

## Agent readiness — 17.6 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | served |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | served |
| Protected Resource Metadata | no |
| Dynamic Client Registration | yes |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |
| MCP Tool Quality | na |

## Access

Paid — onboarding: unknown, pricing: paid, trial: no (confidence: medium).

## APIs (1)

- **Fastmail API** — Fastmail email service API documented at the developer portal.

## Security (2)

- **Fastmail Domain Security** — TLSv1.3 · HSTS · DMARC
- **Fastmail Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Fastmail Plans Pricing**

## Tags

Email, Privacy, Security, Business, Cloud

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