docNCRYPT - docNCRYPT is a cybersecurity platform which only focuses on its core services in protecting your email directly from the different email service provider and allows you to integrate your business email portal in the online service.
Posteo - Web- and IMAP-based email service. 2GB cost 1€/month.
Websense Email Security - Websense Email Security is a powerful email protection tool that helps you strengthen the security of your network.
Inbox.lv - Inbox.lv Mail
Cisco Email Security - Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.
CounterMail - Countermail is a web-based email service. It is hosted in Sweden. Its focus is on privacy.