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Apps with 'S/MIME support' feature
FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. Mutt is a small but very powerful text-based mail client for Unix operating systems. Email Encryption. Encrypt your emails with GnuPG, OpenPGP, S/MIME or your favourite email client. Keep your secret keys secure on your Nitrokey. SMBMail is a groupware server built with a focus on scalability and open standards. It provides secure, enterprise-style email, calendar & collaboration without the high cost.