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Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
Retruster - Bulletproof your company against phishing emails, ransomware and fraud with Retruster.
Cypht - All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.
Barracuda Email Protection - Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.
Mailpile - Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.