.Hi User, please use IMAP.
** It offers two-way syncing between webmail and mail client actions. If you read a message in your email client, it will be marked read on the web! ** Save space by downloading only the message headers, or download whole messages to work offline.
** Your labels appear as folders, and vice versa, so it's easy to stay organized.
** Provides access to Drafts, Sent Mail and Spam folders.
** Great if you check your mail from multiple computers or mobile devices, you'll see the same messages and folders, no matter what email client you're using.
Here's a Link that you can check..
Gmail Support - http://mail.google.com/support/