Email clients empower the users to send their emails without ever having to visit a website. Email clients are incredibly useful when you want to send a message from home or on the go.
Email delivery is what happens when email is sent from one email client and delivered by another email client like Outlook or Windows Live Messenger. Typically, deliver for Outlook is not that great but with implementations like Sendbox and Sparrow, there are some good options for delivering emails from other platforms.
Share a personalized message with your friends.