{
  "slug": "sylpheed",
  "category": "email-clients",
  "name": "Sylpheed",
  "description": "Lightweight GTK email client for Linux, Windows and macOS with POP3, IMAP and SMTP support, junk mail filtering and GnuPG encryption.",
  "website": "https://sylpheed.sraoss.jp/en/",
  "source": "https://github.com/sylpheed-mail/sylpheed",
  "license": null,
  "platforms": [
    "linux",
    "windows",
    "macos"
  ],
  "jurisdiction": null,
  "pick": false,
  "pick_reason": null,
  "disclosure": null,
  "grade": "C",
  "score": 72,
  "coverage": 100,
  "summary": "Sylpheed scores 72 out of 100 (grade C) on the email clients criteria. It meets 6 of 8 criteria: open source, no ads or data sales, OpenPGP support, connects directly, blocks remote content and works with any provider. It does not meet no trackers or telemetry and independent audit.",
  "url": "https://privacyratings.com/email-clients/sylpheed/",
  "markdown": "https://privacyratings.com/email-clients/sylpheed/index.md",
  "answers": {
    "open_source": {
      "title": "Open source",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://github.com/sylpheed-mail/sylpheed/blob/main/LICENSE",
      "note": "GPL-2.0, with the LibSylph library under LGPL."
    },
    "no_trackers": {
      "title": "No trackers or telemetry",
      "weight": 3,
      "answer": "no",
      "evidence": "https://sylpheed.sraoss.jp/en/",
      "note": "The application has no telemetry, but the website loads Google Analytics."
    },
    "no_ads": {
      "title": "No ads or data sales",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://sylpheed.sraoss.jp/en/",
      "note": "Free software. 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": "yes",
      "evidence": "https://sylpheed.sraoss.jp/en/features.html",
      "note": "Signing and encryption with GnuPG are built in."
    },
    "no_cloud_relay": {
      "title": "Connects directly",
      "weight": 3,
      "answer": "yes",
      "evidence": "https://sylpheed.sraoss.jp/en/features.html",
      "note": "Connects directly to POP3, IMAP and SMTP servers. No vendor service is involved."
    },
    "remote_content_blocked": {
      "title": "Blocks remote content",
      "weight": 2,
      "answer": "yes",
      "evidence": "https://github.com/sylpheed-mail/sylpheed/blob/main/libsylph/html.c",
      "note": "HTML mail is converted to plain text for display, so remote content is never loaded."
    },
    "any_provider": {
      "title": "Works with any provider",
      "weight": 1,
      "answer": "yes",
      "evidence": "https://sylpheed.sraoss.jp/en/features.html",
      "note": "Works with any POP3, IMAP and SMTP provider."
    }
  },
  "tests": {
    "ssllabs": null,
    "observatory": null,
    "internetnl_web": null,
    "internetnl_mail": null,
    "trackers": [
      {
        "name": "Google Analytics",
        "host": "inline code",
        "effect": "no"
      },
      {
        "name": "Google Tag Manager",
        "host": "www.googletagmanager.com",
        "effect": "no"
      }
    ],
    "tested_at": "2026-10-01T07:01:48.733Z"
  },
  "last_modified": "2026-10-01T07:44:20Z"
}