Criptext

Criptext is a SMTP email service with a high focus on security. Thanks to this lightweight tool, you can send sensitive data, such as financial reports for example, via email due to the powerful end-to-end encryption and password-protected content.

The app comes with a sleek, stylish interface and user-friendly interface, as it is designed as the standard email client with the dashboard on the left and working area to the right. The highlight of the tool comes from its end-to-end encryption that locks all your messages with a unique key that is solely stored locally on the device you send it from.

The encrypted emails can be sent to virtually any email client, irrespective of whether they have a Criptext account or not. You can further protect the content and attachment by adding a password that you communicate to the recipient. They need to enter it within 10 days to access it before it is automatically deleted.

A noteworthy feature is the email tracking, an option that basically lets you know when the recipient has opened the email. However, you should bear in mind that the app only notifies you when the first email was opened and cannot do the same for the subsequent replies. On a side note, the recipient does not have to have a Criptext email in order for this feature to work.

In the eventuality that you do not want others to know when you open their emails, then you can change this from the Settings menu. Simply toggle off the Read Receipts option to achieve this. Then again, take note that the same applies to you and hence, you are not going to receive notifications when others open your emails.

You should take note that for the time being, you can only be logged in with an individual account at a time. Users with multiple account might find it rather tiresome to switch between their accounts. On the plus size, you can link up to 10 devices from a single account, including mobile, as Criptext comes with Android and iOS version as well.