# SMTP Senpai (MailSenpai)

**Canonical:** https://apis.io/providers/mailsenpai/  
**Website:** https://en.mailsenpai.com/  
**APIs profiled:** 1

MailSenpai is an Italian email service for businesses, operating since 2016 with servers and data hosted in the European Union. It offers two products: an email marketing platform for newsletters and campaigns, and SMTP Senpai, a transactional email relay service with REST API and SMTP access. The service supports Italian and English support, provides DKIM signing, SPF/DKIM/DMARC checks, and detailed sending logs. Plans are tiered with a free trial and pricing in euros, targeting B2B outreach and marketing automation.

## Kin Score — 52.0 / 100 (developing)

Scored 2026-11-06 under rubric 0.27.0. Trend: falling (-8.6 from 60.6).

| Facet | Score |
|---|---|
| Discoverability | 73.2 |
| Contract Quality | 72.2 |
| Contract Governance | 35.6 |
| Operational Transparency | 18.4 |
| Developer Ergonomics | 38.7 |
| Access Clarity | 61.8 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 19.1 (matched via fallback).

## Agent readiness — 52.6 (agent-native)

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

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (7)

- **SMTP Senpai (MailSenpai) Account API** — The Account API from SMTP Senpai (MailSenpai) — 1 operation(s) for account.
- **SMTP Senpai (MailSenpai) Log API** — The Log API from SMTP Senpai (MailSenpai) — 2 operation(s) for log.
- **SMTP Senpai (MailSenpai) Sending API** — The Sending API from SMTP Senpai (MailSenpai) — 1 operation(s) for sending.
- **SMTP Senpai (MailSenpai) SMTP Senpai API** — The SMTP Senpai API API from SMTP Senpai (MailSenpai) — 0 operation(s) for smtp senpai api.
- **SMTP Senpai (MailSenpai) Suppression API** — The Suppression API from SMTP Senpai (MailSenpai) — 3 operation(s) for suppression.
- **SMTP Senpai (MailSenpai) Webhooks API** — The Webhooks API from SMTP Senpai (MailSenpai) — 2 operation(s) for webhooks.
- **SMTP Senpai (MailSenpai) Website forms API** — The Website forms API from SMTP Senpai (MailSenpai) — 1 operation(s) for website forms.

## Agentic access (1)

- **Mailsenpai Agentic Access** — 13 operations · 6 acting

## Security (2)

- **Mailsenpai Authentication** — 1 scheme
- **Mailsenpai Domain Security** — TLSv1.3 · DMARC

## Plans (2)

- **Mailsenpai Plans Pricing**
- **Mailsenpai Price Estimates**

## Tags

Email Marketing, B2B outreach, SMTP relay, Artificial Intelligence, Newsletter platform

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