Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
clearout.io - Clearout Email Finder & Email Verification Service - Drive sustainable business growth by expanding your reach, lowering hard bounces, and improving deliverability rates.