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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.
Roundcube - Web-based IMAP email client
Barracuda Email Protection - Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.