Zoho Mail - Zoho Mail is a secure, encrypted, and enterprise-ready email solution, a suite of apps tailor-made for your organization's needs.
Barracuda Email Security Service - Secure Email Gateway
FastMail - Email, calendars, and contacts to highest standards of security, privacy and reliability.
Cryptshare - Cryptshare is an online security company that gives its facility in securing your emails, uploading large files on cloud platforms to provide you with its compliance.
Rackspace Email Hosting - Rackspace Email Hosting is a platform that provides business with web-hosted email services.
Proxmox Mail Gateway - Protect mail server against spam, viruses and malware with Proxmox Mail Gateway security for businesses, government, education and non-profit organizations.