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Interference with .gpg attachments in plain email messages #6214

@sosnovsky

Description

@sosnovsky

When user receives a non-encrypted email with a .gpg attachment created in Kleopatra/GnuPG, FlowCrypt intercepts the attachment and shows its own passphrase/decryption UI.

This is confusing when FlowCrypt doesn't have the matching key to decrypt the file. In that case, the attachment should stay a normal downloadable file so the user can open it with their usual app, such as Kleopatra.

Steps To Reproduce

  • Send a non-encrypted email with a real .gpg file attached
  • Open the email in Gmail with FlowCrypt installed
  • Click the attachment

Actual Result
FlowCrypt replaces the normal attachment behavior and prompts for key passphrase.

Expected Result
FlowCrypt should only handle the attachment if it has the correct decryption key. If it doesn't have a matching key, the .gpg file should remain a normal attachment that the user can download and open externally.

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