How to Check for New Mail in Mac OS X Lion
Mail is a program in Mac OS X Lion for sending, receiving, and organizing your e-mail. How do you check and open your mail? In OS X Lion just click the Get Mail button at the top of the main Mail window or press Command+Shift+N.
To read a new message, select it. Its contents appear in the Message Content pane.
To delete a selected message, click the Delete button on the toolbar.
To retrieve a message you accidentally deleted, click Trash on the left and drag the message into the Inbox or other mailbox.
To configure Mail to send and check for your mail every X minutes, choose Mail→Preferences and then click the General icon at the top of the window. Pull down the Check for New Mail pop-up menu and make a selection — every 1, 5, 15, 30, or 60 minutes — or choose Manually if you don’t want Mail to check for mail automatically at all. (The default setting is to check for mail every 5 minutes.)
Adding a sender to your Address Book has an additional benefit: It guards messages from that person against being mistaken for junk mail. In other words, your Address Book is a white list for the spam filter; if specific senders appear in your Address Book, their messages will never be mistakenly marked as junk mail.