Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
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Aqua Mail - Android Mail Client.
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
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Barracuda Email Protection - Barracuda Essentials offers advanced Office 365 security features including email scanning, archiving, backup & recovery, and real-time phishing defense.