Forwarding other email accounts to iCloud email
I have several emails and have them all set up on Mac mail. To help consolidate all my emails I've set up Mac mail to forward one of my aol accounts to my iCloud. The forwarding works on both the Mac and my iPhone 4s but if my computer goes to sleep or the mail program isn't running none of my emails from my aol account will forward. Any solutions to this ?
MacBook Pro, Mac OS X (10.7.2)