

EASY TO USE
Actionsteps
Actionsteps solves the flagging problem, where every email you know that you need to respond to is of equal importance.
With Actionsteps you’ve a great tool that just complement your existing GTD workflow. Just one click and you added an Actionstep with a priority. Read the full concept for more information about how Actionsteps work.

CENTRALIZED
Attachments
Imagine finding every attachment someone sent you, sorted by date or name directly in your email client? It's similar to the “All your files” functionality in your OSX Finder.
It comes in handy quite often, because you have all your attachments in one place, even if they haven’t been downloaded yet. Then you can drag and drop your files to wherever you want.

INTEGRATED
Notifications
We’re getting a lot of Notifications these days. Basically we like the push character, we just don’t like it in our inbox.
So .Mail takes a Notification email out of your inbox and automatically turns it into a little notification. This means you still have the push message, but it’s not mixing up with your real and important emails anymore.
Source
7-29-12