HEY Email

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HEY is an email app that lets you send and receive messages within a user-friendly interface, write private notes, manage attachments, and create custom labels for better organization. Read more about HEY Email  

The mobile solution created by Basecamp aims to be an excellent companion for anyone who wants to block email spies and protect their privacy. It is easy to use and does not ask you to authorize intrusive permissions after the installation. However, it requires you to create an email account, but that activity takes less than a minute.
After completing the preparatory steps, users may start sending and receiving messages within the new inbox. They get the chance to separate newsletters from other categories of emails, group receipts, or confirmations in the 'Paper Trail' section and set aside particular items. Moreover, users can move messages to the 'Reply Later' pile whenever they want to delay specific responses and make sure they will not forget those notices.
Another aspect worth mentioning is that the app lets anyone define personalized labels for better systematization of their emails, ignore particular threads, receive push notifications, and write private notes. Furthermore, users can manage all attachments in a single place and avoid searching among hundreds of messages whenever they want to find a document or any other file.