If you are a Smile user you can use your Smile log on ID as a Email address. Right now their web interface is down. But you can use it with any Email client (Thunderbird, Outlook Express etc).
How to configure it:
Incoming Mail Server Address: mail.smile.com.bd
Outgoing Mail Server Address: mail.smile.com.bd
But why you will use this Email instead of web based gmail, yahoo, live?
01. You can get your desired name with smile.com.bd what you cant have with others.
02. Using Email Client is easy and very fast for sending and recieving Emails which can not be done with most of the free email host like : Live and yahoo (except gmail).
03. Above of all, Emailing with smile is super fast. no matter how big your email is, it will be delivered in a second ... just like magic! Amazing! Why dont you try it and see?