Official Web Site:  http://www.sparrowmailapp.com/

Sparrow is a minimalist mail application for Mac. It was designed to keep things simple and efficient. No fancy stuff here… just your mail and nothing else
.
Threads Quickly flick through threaded conversations on your mac like never before.

Not so minimal… See your mails the way you want. Quickly glance at the preview. Read it in a new window or open the right pane to enjoy Sparrow’s full potential.

* Notifications Growl is integrated for notifications addicts.

* Multiple Accounts Seamlessly switch between your mail accounts.

* What’s next? Sparrow will soon support several IMAP email providers
  and integrate labels for Gmail users.

New in Version 1.4

* GetCloudApp integration: directly upload your attachments to the cloud. 

* Drag, Drop, it’s in the cloud. Share file fast.

* Reversed threads ( à la Gmail): simply reverse the order of messages in the conversation view from Sparrow Preferences

* Pull-to-refresh

* Cmd-A now works to select all text in the conversation view

UI:

* Default image in conversation view when no message or multiple
  message are selected

* Default compose window size is kept

* Message list keeps its default size when resizing the window

* Sidebar animations when showing/hiding

Under the hood:

* Sending performance

* New draft management system

* Bad network/offline behavior

* Improvement on mail database

* Synchronization performance

Bug fixes:

* Zoho compatibility

* Lotus Domino compatibility

* Free compatibility

* Dovecot server

* Crash on Send & Archive and various crashes

* Animation bug when un-minimizing Sparrow from the Menu bar icon

* Hanging issue on Mac OS X 10.7 Lion

* Erased space in signature

* ‘Not Spam’ option in the Spam folder

System Requirements:

Intel Mac OS X.6 and above

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