Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues

Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.

Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.

Hornetsecurity - Hornetsecurity offers you comprehensive, integrated managed e-mail security services.

myMail - myMail is the smart email app for managing all your accounts on iOS and Android.

SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.