Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Polymail - Native email app for email productivity.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Revo Mortgage Collaboration - Revo is a cloud based deal management service, it addresses the missing technology gap for mortgage application process and workflow management for high volume mortgage producers and their assistants using a cloud based CRM service solution
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.