Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Zero Email App - Think of it as a private Google PageRank for your inbox
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Tomba.io - Tomba is the leading solution to find and verify professional email addresses. Start using Tomba and connect with the people that matter for your business.
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.