Sparrow

Sparrow is an iPhone mail client designed with love to provide you with an efficient and pleasant mailing experience.With its pane navigation, its new threading system and many new features, you'll never look back.

Warning: Sparrow does not support POP accounts yet.

Features:

• Full IMAP support: Use your Gmail, Google Apps, iCloud, Yahoo, AOL, Mobile Me and custom IMAP accounts.
• Unified Inbox:All your mails in a unique mailbox.
• Attachments:Directly attach photos & images when composing a mail. No more cumbersome back and forth with your photo library.
• Up & down your conversations:Swipe up of down on a message to navigate a conversation.
• Everything is a swipe away
  • Swipe once to uncover your mailboxes, labels and folders.
  • Swipe again to get to your account list.
• Faces:Mail is much nicer with your friends' profile pictures.
• Message swipe:Star, add a label, archive or delete a conversation right away simply by swiping a message.
• Smart contacts:Your most frequent contacts on top of the list.
• Quick mailbox switch:Navigate between your inbox, unread and favorites by tapping/swiping the top bar.
• Mark all as read:One click to rule them all. You can also press a message for a few seconds to mark it as read/unread.
• Thread view:Tap the top bar in the conversation to quickly navigate all messages in a thread.
• Pull to refresh:Finally, the simplest way to refresh comes to email.
• Priority Inbox support:Automatically identify your important email and separates it out from everything else.
• Alias:Have a pro and a private mail address? Use alias to keep things separated.
• Powerful search:Local and remote search allow you to find the mail you're looking for.

And many more features crafted with love to discover:

• Quick sender switch in compose window
• Mark all as read
• Read/unread with a long press on a message cell
• Reply all quick switch…