Polymail - Native email app for email productivity.

Campaign Genius - Send dynamic email content through any platform, instantly.

Airmail - Airmail is a lightweight and lightning fast mail client for Mac.

GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!

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

MailChimp Snap - Send simple, photo-based email campaigns from your phone.