{
  "slug": "mimestream",
  "category": "email-clients",
  "name": "Mimestream",
  "description": "Closed-source macOS email client for Gmail and Google Workspace accounts that syncs through the Gmail API and supports labels, filters and inbox categories.",
  "website": "https://mimestream.com",
  "license": null,
  "platforms": [
    "macos"
  ],
  "jurisdiction": {
    "code": "US",
    "name": "United States",
    "eyes": "Five Eyes",
    "eu": false,
    "gdpr": false,
    "cloud_act": "provider"
  },
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "D",
  "score": 50,
  "coverage": 100,
  "summary": "Mimestream scores 50 out of 100 (grade D) on the email clients criteria. It meets 2 of 8 criteria: no trackers or telemetry and no ads or data sales. It partly meets independent audit, connects directly, blocks remote content and works with any provider. It does not meet open source 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/mimestream/",
  "markdown": "https://privacyratings.com/email-clients/mimestream/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "no",
      "evidence": null,
      "note": "Closed source."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://mimestream.com/trust/subprocessors",
      "note": "No analytics services are listed among subprocessors or in the privacy policy, and the website loads no third-party trackers."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://mimestream.com/pricing/",
      "note": "Funded by paid subscriptions. No ads."
    },
    "independent_audit": {
      "title": "Independent audit",
      "weight": 2,
      "answer": "partial",
      "evidence": "https://mimestream.com/trust/assets/Mimestream_CASA_2026.pdf",
      "note": "A CASA Tier 2 assessment by TAC Security is published only as a letter of validation, not a full report."
    },
    "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": "https://mimestream.com/trust/security-and-privacy",
      "note": "Neither PGP nor S/MIME is supported."
    },
    "no_cloud_relay": {
      "title": "Connects directly",
      "weight": 3,
      "answer": "partial",
      "evidence": "https://mimestream.com/trust/private-push",
      "note": "Syncs directly with the Gmail API and keeps tokens on the device, but Private Push notifications, on by default on recent macOS, pass through a Mimestream relay that never receives credentials or message content."
    },
    "remote_content_blocked": {
      "title": "Blocks remote content",
      "weight": 2,
      "answer": "partial",
      "evidence": "https://mimestream.com/help/user-guide/viewing-settings",
      "note": "Remote images can be blocked in settings, and a tracker blocker is available."
    },
    "any_provider": {
      "title": "Works with any provider",
      "weight": 1,
      "answer": "partial",
      "evidence": "https://mimestream.com/help/user-guide/supported-accounts",
      "note": "Works only with Gmail and Google Workspace accounts."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [],
    "tested_at": "2026-10-01T07:01:48.673Z"
  },
  "last_modified": "2026-10-01T07:44:20Z"
}