Inky is described as 'Using your existing email accounts, Inky lets you exchange encrypted and digitally signed emails with anyone — your recipients don't need to install anything or remember a special password. Encryption provides confidentiality, and signing provides sender verification to help' and is a popular Email Client in the security & privacy category. There are more than 25 alternatives to Inky for a variety of platforms, including Mac, iPhone, Windows, Android and iPad apps. The best Inky alternative is Thunderbird, which is both free and Open Source. Other great apps like Inky are Gmail, Tuta Mail, Microsoft Outlook and eM Client.