# MailHog

- **Canonical URI:** https://www.vioscale.ai/software/mailhog
- **Category:** Email Testing Dev
- **Homepage:** https://github.com/mailhog/MailHog
- **Also known as:** mailhog
- **Profile claimed by vendor:** no
- **Last updated:** 2026-08-26T19:18:12.844Z

## Vioscale score

**42.8 / 100**, confidence 19% (low). Computed 2026-09-01.

Composite of weighted, independently-sourced signals (no user reviews, no vendor payment).

| Signal | Score | Weight | Contribution | Evidence present |
|---|--:|--:|--:|:--:|
| price_level | 0 | 0.052 | 0 | - |
| reliability | 0 | 0.073 | 0 | - |
| capabilities | 74.7 | 0.084 | 6.3 | ✓ |
| repo_stars | 79.4 | 0.026 | 2.1 | ✓ |
| integrations | 0 | 0.09355555555555557 | 0 | - |
| dependent_projects | 18 | 0.063 | 1.1 | ✓ |
| dev_activity | 0 | 0.094 | 0 | ✓ |
| release_cadence | 93.9 | 0.052 | 4.9 | ✓ |
| security_posture | 0 | 0.073 | 0 | - |
| package_downloads | 0 | 0.136 | 0 | - |
| security_score | 26 | 0.042 | 1.1 | ✓ |
| pricing_transparency | 0 | 0.084 | 0 | - |
| community_qa_activity | 0 | 0.063 | 0 | - |

## About

MailHog intercepts and stores SMTP messages during development, providing a web UI and JSON API for viewing and managing test emails, with the option to forward messages to real mail servers.

_Independently observed._

## Platform & deployment

- **Platforms:** macOS, Web, Linux
- **Deployment:** Cloud / SaaS, Self-hosted

## Capabilities

_The capabilities that matter for Email Testing Dev. "-" = undocumented, not absent._

| Capability | Supported |
|---|:--:|
| **Capabilities** | |
| API assertions | ✓ |
| Rendering preview | ✓ |
| Spam score check | ✗ |
| Blocklist deliverability check | ✗ |
| SMS testing | ✗ |
| Production sending addon | ✓ |
| Ci cd integration | ✗ |
| Multi user inboxes | ✓ |
| Open source | ✓ |

## Release history

| Version | Date | Type |
|---|---|---|
| [v1.0.1](https://github.com/mailhog/MailHog/releases/tag/v1.0.1) | 2020-08-11 | stable |
| [v1.0.0](https://github.com/mailhog/MailHog/releases/tag/v1.0.0) | 2017-04-16 | stable |
| [v0.2.1](https://github.com/mailhog/MailHog/releases/tag/v0.2.1) | 2016-09-04 | stable |
| [v0.2.0](https://github.com/mailhog/MailHog/releases/tag/v0.2.0) | 2016-03-20 | stable |
| [v0.1.9](https://github.com/mailhog/MailHog/releases/tag/v0.1.9) | 2016-03-13 | stable |
| [v0.1.8](https://github.com/mailhog/MailHog/releases/tag/v0.1.8) | 2015-10-06 | stable |
| [v0.1.7](https://github.com/mailhog/MailHog/releases/tag/v0.1.7) | 2015-05-20 | stable |
| [v0.1.6](https://github.com/mailhog/MailHog/releases/tag/v0.1.6) | 2015-03-14 | stable |
| [v0.1.5](https://github.com/mailhog/MailHog/releases/tag/v0.1.5) | 2015-02-12 | stable |
| [v0.1.4](https://github.com/mailhog/MailHog/releases/tag/v0.1.4) | 2015-02-12 | stable |
| [v0.1.3](https://github.com/mailhog/MailHog/releases/tag/v0.1.3) | 2015-01-08 | stable |
| [v0.1.2](https://github.com/mailhog/MailHog/releases/tag/v0.1.2) | 2015-01-08 | stable |
| [v0.1.1](https://github.com/mailhog/MailHog/releases/tag/v0.1.1) | 2015-01-04 | stable |
| [v0.1.0](https://github.com/mailhog/MailHog/releases/tag/v0.1.0) | 2014-12-27 | stable |
| [0.09](https://github.com/mailhog/MailHog/releases/tag/0.09) | 2014-12-24 | prerelease |

_… and 5 earlier release(s)._

## Security & compliance


Known vulnerabilities: 0 (0 in the last 12 months) ([source](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fmailhog%2FMailHog&per_page=100)). A count reflects scale and disclosure, not quality.

## Facts

Every value below carries its source and our confidence. Facts are re-crawled on a freshness schedule.

### pricing

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| pricing.model | commercial | [link](https://github.com/mailhog/MailHog) | 2026-08-26 | 40% (low) |

### activity

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| activity.commits_last_30d | 0 | [link](https://github.com/mailhog/MailHog/pulse) | 2026-08-18 | 65% (medium) |

### adoption

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| adoption.github_stars | 16,138 | [link](https://github.com/mailhog/MailHog) | 2026-08-26 | 90% (high) |
| adoption.dependent_repos | 11 | [link](https://packages.ecosyste.ms/api/v1/packages/lookup?repository_url=https%3A%2F%2Fgithub.com%2Fmailhog%2FMailHog) | 2026-08-26 | 85% (high) |

### language

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| language.primary | Go | [link](https://github.com/mailhog/MailHog) | 2026-08-26 | 90% (high) |

### license

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| license.spdx | MIT | [link](https://github.com/mailhog/MailHog) | 2026-08-26 | 95% (high) |

### release

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| release.cadence_days | 11 | [link](https://github.com/mailhog/MailHog/releases) | 2026-08-26 | 70% (medium) |

### security

| Attribute | Value | Source | Retrieved | Confidence |
|---|---|---|---|---|
| security.scorecard | 2.6 | [link](https://api.securityscorecards.dev/projects/github.com/mailhog/MailHog) | 2026-08-26 | 90% (high) |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fmailhog%2FMailHog&per_page=100","last_12m":0,"max_severity":null}` | [link](https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fmailhog%2FMailHog&per_page=100) | 2026-08-26 | 90% (high) |

---
*Source: Vioscale (https://www.vioscale.ai/software/mailhog). Independent, evidence-based software intelligence. Cite the canonical URI.*