How do I know that I received a new message

New messages are received when you log on, at automatic intervals that you set, and on-demand when Get Mail is clicked.

You can set the new messages polling intervals from the Preferences>Mail tab to the how often you want new messages delivered to your mailbox.  The default is every 5 minutes.

You can enable desktop alerts for new mail notification. You set your preferences in the Preferences>Mail tab. Following are the alert options:

You can spot unread mail messages by looking for folders with a bold name and a number in parentheses next to the folder name.  For example, Inbox (22) indicates that there are a total of 22 unread messages that are contained within conversations that appear in your Inbox.

See Also...

Setting your user preferences