OpenKeychain alternatives
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Enigmail
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Enigmail is a security extension to Mozilla Thunderbird and SeaMonkey. It enables you to write and receive email messages signed and/or encrypted with the OpenPGP standard.
tags: thunderbird-extension email-encryption seamonkey-extension
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Ciphermail for Android
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S/MIME email encryption and digital signatures for Android devices
tags: email-encryption secure-email smime