ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
Riseup - Riseup provides online communication tools for people and groups working on liberatory social change. We are a project to create democratic alternatives and practice self-determination by controlling our own secure means of communications.
GPGMail - GPGMail is an open source plugin for Apple Mail.
Zoho Mail - Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs.
Posteo - Web- and IMAP-based email service. 2GB cost 1€/month.