What are some alternatives?
Email on Acid - Save time and drive revenue by testing your email before you hit send.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Interseller - Interseller helps find contact information, reach out to them with email automation and syncs it all into your database.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
Front App - multi-channel inbox service for collaborative teams
Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.