{
  "slug": "mailspring",
  "category": "email-clients",
  "name": "Mailspring",
  "description": "Open-source desktop email client for Windows, macOS and Linux with a unified inbox and optional paid features such as read receipts and send later.",
  "website": "https://www.getmailspring.com",
  "source": "https://github.com/Foundry376/Mailspring",
  "license": "GPL-3.0",
  "platforms": [
    "windows",
    "macos",
    "linux"
  ],
  "jurisdiction": {
    "code": "US",
    "name": "United States",
    "eyes": "Five Eyes",
    "eu": false,
    "gdpr": false,
    "cloud_act": "provider"
  },
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "F",
  "score": 39,
  "coverage": 100,
  "summary": "Mailspring scores 39 out of 100 (grade F) on the email clients criteria. It meets 2 of 8 criteria: no ads or data sales and works with any provider. It partly meets open source, connects directly and blocks remote content. It does not meet no trackers or telemetry, independent audit and OpenPGP support. It is based in the United States: Five Eyes member; subject to the US CLOUD Act.",
  "url": "https://privacyratings.com/email-clients/mailspring/",
  "markdown": "https://privacyratings.com/email-clients/mailspring/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "partial",
      "evidence": "https://github.com/Foundry376/Mailspring/blob/master/LICENSE.md",
      "note": "The app and its sync engine are GPL-3.0, but the Mailspring ID service behind the Pro features is closed source."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "no",
      "evidence": "https://www.getmailspring.com/privacy-policy",
      "note": "The website loads Google Analytics, and the privacy policy lists Mixpanel, Intercom and Google Analytics for tracking."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://www.getmailspring.com/pro",
      "note": "Funded by the Mailspring Pro subscription. The app shows no ads."
    },
    "independent_audit": {
      "title": "Independent audit",
      "weight": 2,
      "answer": "no",
      "evidence": null,
      "note": "No independent audit is published."
    },
    "transparency_report": {
      "title": "Transparency report",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "user_notice": {
      "title": "Tells users about requests",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "tls": {
      "title": "TLS configuration",
      "weight": 2,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "security_headers": {
      "title": "Security headers",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "web_standards": {
      "title": "Modern web standards",
      "weight": 1,
      "answer": "n/a",
      "evidence": null,
      "note": "Only applies to hosted services with a website to test."
    },
    "openpgp": {
      "title": "OpenPGP support",
      "weight": 2,
      "answer": "no",
      "evidence": null,
      "note": "Not supported."
    },
    "no_cloud_relay": {
      "title": "Connects directly",
      "weight": 3,
      "answer": "partial",
      "evidence": "https://www.getmailspring.com/privacy-policy",
      "note": "Credentials stay in the system keychain and mail syncs directly, but linked addresses are sent to Mailspring servers for features such as read receipts."
    },
    "remote_content_blocked": {
      "title": "Blocks remote content",
      "weight": 2,
      "answer": "partial",
      "evidence": "https://github.com/Foundry376/Mailspring/blob/master/app/src/config-schema.ts",
      "note": "Images load automatically by default. Automatic loading can be turned off in settings."
    },
    "any_provider": {
      "title": "Works with any provider",
      "weight": 1,
      "answer": "yes",
      "evidence": "https://www.getmailspring.com",
      "note": "Works with any IMAP and SMTP provider."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [
      {
        "name": "Google Fonts",
        "host": "fonts.googleapis.com",
        "effect": "none"
      },
      {
        "name": "X (Twitter) Pixel",
        "host": "static.ads-twitter.com",
        "effect": "no"
      }
    ],
    "tested_at": "2026-10-01T07:02:35.346Z"
  },
  "last_modified": "2026-10-01T07:44:20Z"
}