An end-to-end encrypted email service from Proton.
Proton Mail provides encrypted email with web and mobile apps, plus related Proton services such as calendar and drive. As of writing, a free tier and paid plans are available.
A free plan with limits exists; paid plans add storage and features.
Custom domains are supported on paid plans.
Information and links are accurate as of the time of writing and may change. Always verify on the official site. This is an independent guide, not affiliated with the listed services.