If you don't want to forward them to a single account and you're using Firefox, you might try the WebMail notifier extension. It'll work with most webmail accounts, POP3 and IMAP. I use it for about 15 accounts and it works great. I'm not sure if it has a maximum limit. If you go this route, the extension will check email on the interval you specify and it's easy to click and access the account directly.