dmarcian - Safeguard your email from abuse
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
EasyDMARC - Cloud Native DMARC
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Proofpoint - Proofpoint provides cloud-based email security, e-discovery and compliance solutions for companies to protect sensitive business data.
myMail - myMail is the smart email app for managing all your accounts on iOS and Android.