SaneBox

SaneBox's suite of time-saving email features will boost you and your team's productivity: intelligent email filtering - SaneBox moves unimportant messages out of the Inbox into a new folder called SaneLater, and summarizes them in a digest. Follow-up reminders - SaneBox notifies you when an email you sent was not replied to by a certain time. One-click unsubscribe - drag email into the SaneBlackHole folder, and you'll never hear from that sender again. Cloud connectivity - Sane Attachments scans emails in your Inbox for attachments, puts them in Dropbox or Box, and replaces them with a link.'

Limitations:

Experience all features for free for 14 days!