# GreenMail vs MailHog

| Attribute | GreenMail | MailHog |
|---|---|---|
| **Vioscale score** | 58.2 (31% (low)) | 42.8 (19% (low)) |
| activity.commits_last_30d | 28 | 0 |
| adoption.dependent_repos | 2,587 | 11 |
| adoption.github_stars | 740 | 16,138 |
| deployment.options | `{"self_hosted":true}` | `{"cloud":true,"self_hosted":true}` |
| description.long | A testing framework that emulates email server behavior (SMTP, POP3, IMAP) to help developers verify email functionality in their applications during testing, without requiring actual email infrastructure or sending real messages. | 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. |
| features.capabilities | `{"open_source":true,"sms_testing":false,"api_assertions":true,"spam_score_check":false,"ci_cd_integration":true,"rendering_preview":false,"multi_user_inboxes":true,"production_sending_addon":false,"blocklist_deliverability_check":false}` | `{"open_source":true,"sms_testing":false,"api_assertions":true,"spam_score_check":false,"ci_cd_integration":false,"rendering_preview":true,"multi_user_inboxes":true,"production_sending_addon":true,"blocklist_deliverability_check":false}` |
| language.primary | Java | Go |
| license.spdx | Apache-2.0 | MIT |
| platform.support | - | `{"mac":true,"web":true,"linux":true}` |
| pricing | `{"type":"open_source","freeTier":true,"sourceUrl":"https://greenmail-mail-test.github.io/greenmail/","retrievedAt":"2026-08-21T12:46:10.376Z"}` | - |
| pricing.free_tier | yes | - |
| pricing.model | commercial | commercial |
| pricing.price_level | free | - |
| release.cadence_days | 43 | 11 |
| release.history | `[{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.13","date":"2026-08-23T10:02:24Z","type":"stable","version":"release-2.1.13"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.12","date":"2026-08-05T18:50:04Z","type":"stable","version":"release-2.1.12"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.11","date":"2026-07-15T19:46:18Z","type":"stable","version":"release-2.1.11"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.10","date":"2026-07-14T09:57:41Z","type":"stable","version":"release-2.1.10"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.9","date":"2026-06-14T17:01:37Z","type":"stable","version":"release-2.1.9"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.8","date":"2025-12-14T17:26:41Z","type":"stable","version":"release-2.1.8"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.7","date":"2025-10-07T21:21:09Z","type":"stable","version":"release-2.1.7"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.6","date":"2025-09-28T18:47:25Z","type":"stable","version":"release-2.1.6"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.5","date":"2025-08-10T18:41:13Z","type":"stable","version":"release-2.1.5"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.4","date":"2025-07-13T16:54:29Z","type":"stable","version":"release-2.1.4"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.3","date":"2025-02-04T20:59:33Z","type":"stable","version":"release-2.1.3"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.2","date":"2024-11-30T11:21:39Z","type":"stable","version":"release-2.1.2"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.1","date":"2024-11-17T21:12:57Z","type":"stable","version":"release-2.1.1"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.0","date":"2024-10-05T16:20:21Z","type":"stable","version":"release-2.1.0"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.0-rc-1","date":"2024-05-31T20:05:52Z","type":"stable","version":"release-2.1.0-rc-1"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.0-alpha-4","date":"2024-01-28T18:47:27Z","type":"stable","version":"release-2.1.0-alpha-4"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-1.6.15","date":"2023-12-03T15:51:55Z","type":"stable","version":"release-1.6.15"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.0.1","date":"2023-11-17T21:42:15Z","type":"stable","version":"release-2.0.1"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.0-alpha-3","date":"2023-11-04T13:17:06Z","type":"stable","version":"release-2.1.0-alpha-3"},{"url":"https://github.com/greenmail-mail-test/greenmail/releases/tag/release-2.1.0-alpha-2","date":"2023-08-20T20:17:02Z","type":"stable","version":"release-2.1.0-alpha-2"}]` | `[{"url":"https://github.com/mailhog/MailHog/releases/tag/v1.0.1","date":"2020-08-11T18:04:41Z","type":"stable","version":"v1.0.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v1.0.0","date":"2017-04-16T23:36:18Z","type":"stable","version":"v1.0.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.2.1","date":"2016-09-04T18:31:48Z","type":"stable","version":"v0.2.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.2.0","date":"2016-03-20T17:23:21Z","type":"stable","version":"v0.2.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.9","date":"2016-03-13T19:24:01Z","type":"stable","version":"v0.1.9"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.8","date":"2015-10-06T20:29:59Z","type":"stable","version":"v0.1.8"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.7","date":"2015-05-20T20:03:57Z","type":"stable","version":"v0.1.7"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.6","date":"2015-03-14T10:01:38Z","type":"stable","version":"v0.1.6"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.5","date":"2015-02-12T21:30:55Z","type":"stable","version":"v0.1.5"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.4","date":"2015-02-12T20:57:47Z","type":"stable","version":"v0.1.4"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.3","date":"2015-01-08T22:36:13Z","type":"stable","version":"v0.1.3"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.2","date":"2015-01-08T21:17:03Z","type":"stable","version":"v0.1.2"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.1","date":"2015-01-04T12:54:33Z","type":"stable","version":"v0.1.1"},{"url":"https://github.com/mailhog/MailHog/releases/tag/v0.1.0","date":"2014-12-27T13:50:55Z","type":"stable","version":"v0.1.0"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.09","date":"2014-12-24T13:40:49Z","type":"prerelease","version":"0.09"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.08","date":"2014-12-21T09:34:14Z","type":"prerelease","version":"0.08"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.07","date":"2014-11-18T08:10:22Z","type":"prerelease","version":"0.07"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.06","date":"2014-11-13T18:23:01Z","type":"prerelease","version":"0.06"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.05","date":"2014-11-01T22:51:22Z","type":"prerelease","version":"0.05"},{"url":"https://github.com/mailhog/MailHog/releases/tag/0.04","date":"2014-10-29T18:53:09Z","type":"prerelease","version":"0.04"}]` |
| security.scorecard | 6.4 | 2.6 |
| security.vulnerabilities | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=maven&package_name=com.icegreen%3Agreenmail&per_page=100","last_12m":0,"max_severity":null}` | `{"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}` |

## Capabilities (Email Testing Dev)

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

*Source: Vioscale. Generated 2026-09-01T16:29:57.343Z. "-" = undocumented, not absent.*