ProtonMail
Access a suite for secure email exchange and management. Work with PGP end-to-end encryption options for protecting and restricting access to individual messages and entire mailboxes with cross-platform content, including emails and attachments from iOS devices.
Downloading ProtonMail 1.6.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Proton Technologies AG. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The program is categorized as Communication Tools.
From the developer:
ProtonMail is an encrypted e-mail service with over 1 million users. The ProtonMail secure e-mail app for iPhone and iPad brings easy-to-use e-mail encryption to your mobile device by seamlessly integrating PGP end-to-end encryption. ProtonMail also provides a modern user interface with a full set of innovative features, such as customizable swipe gestures and the ability to send expiring e-mails.
You may want to check out more Mac applications, such as Openly a Link - Browser Picker, which might be similar to ProtonMail.
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Fantastic.