Although ProtonMail does not offer a money-back guarantee, it offers a completely free plan where you can have all your emails encrypted for as long as you want with only a few limitations, such as 150 daily messages and 500MB of storage. Nevertheless, it’s the perfect way to test the email service before you decide to upgrade to the Plus version.
Use ProtonMail with all of its main features, such as end-to-end email encryption, free of charge.