Currently, some users receive administrative emails from tax authorities, government agencies, and other public institutions that are signed using S/MIME digital signatures. However, in Proton Mail these signatures are only displayed as a .p7s attachment, and the signature itself cannot be viewed or verified within the email.

This missing functionality is a significant disadvantage compared with Outlook and other email providers that support S/MIME signature verification natively. Would it be possible to add support for viewing and validating S/MIME digital signatures in Proton Mail?