AquaMail syncs to your Gmail, Yahoo, or Hotmail account and offers “a myriad of ways” to sort messages and provide quick replies. You can use the app for free, or pay a $5 monthly fee if you want to sync email accounts and get rid of promos. (Android)
Mailbox “makes dealing with messages
super-fast.” Just swipe your phone’s touchscreen to move a message to “trash,” “archive,” or—best of all—“snooze.” Messages dropped in that last folder will be re-sent to you later, at a time of your choosing. The app is only available for Gmail now, but there are plans to add other email services soon. (Free, iOS)
K-9 Mail is a free app that’s “useful because it can sync multiple accounts and display them in a unified inbox.” The user interface “allows for plenty of customization.” (Android only)
Source: Techlicious.com