How to safely parse and render email files directly in the browser

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Parsing EML and TNEF email files in the browser eliminates server uploads but introduces new security risks, as untrusted content runs alongside the user's active web session. Developers must sanitize HTML aggressively by stripping scripts, forms, iframes, and unsafe protocols, using a maintained sanitizer with a pinned and customized configuration. Inline images should be served via local Blob URLs rather than fetching remote resources, which can expose user data through tracking pixels. Remote images must be blocked by default and only loaded after an explicit user action per message, with no permissions persisting to other emails. A unified message model for both EML and TNEF formats ensures consistent security enforcement across parsers and the viewer layer.

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