Product boundaries
Supported features and honest limitations
The readable PDF is a normalized derivative. The preservation package keeps the source needed to inspect anything the renderer simplifies.
Subject, addresses, datePreservedIncluded in PDF and manifest
Message-IDPreservedIncluded when present in the source
Plain-text bodyPreservedRendered as searchable text
HTML bodyNormalizedComplex CSS and client-specific layout are simplified
Original attachmentsPreservedBytes retained and SHA-256 recorded
Remote imagesBlockedPrevents tracking and network disclosure
Clickable email linksBlockedPreview links are inert to reduce phishing and accidental disclosure
Original EMLPreservedIncluded untouched in preservation ZIP
Batch EML processingSupportedUp to 25 files and 75 MB combined source data
Archive verificationSupportedChecksums, manifest agreement, signed-file coverage, and safe paths
Digital signature validationNot supportedExisting signature material remains in the source
PDF/ANot supportedNo claim until formal conformance testing passes
MSG filesNot supportedThe current release deliberately focuses on open EML
Files over 25 MBNot supportedBounded to protect browser memory and responsiveness
Browser policy
Popular browsers and operating systems
We target the current and previous stable releases below. Automated release tests cover Chromium, Firefox, and WebKit desktop engines. Physical iPhone, iPad, Android, and older-device testing remains part of the launch checklist. Browser memory limits may reduce practical batch capacity on mobile devices.
ChromeCurrent and previous stableWindows, macOS, Linux, Android
Microsoft EdgeCurrent and previous stableWindows and macOS
FirefoxCurrent and previous stableWindows, macOS, Linux
SafariCurrent and previous stablemacOS and iOS/iPadOS
Other modern Chromium browsersBest effortRecent desktop and Android releases