Okay, I've done some minor testing. AOL does not, to the best of my knowledge, work with push notifications, so you will have to configure the polling frequency to get it to automatically check your mail.
If you have k9 mail (and I recommend it for this, it is a very good email client, I use it myself...it is free on the Android market), set up your AOL account. This should be self explanatory, but if you get stuck, I'd be more than happy to help you out.
Once you have that up, long press your account and select Account settings. In there, you will select Fetching mail, then Folder poll frequency. You can set this pretty low, but I would recommend ten or fifteen minutes. Less than that will impact your battery, though you can play around with that and see how it works for you.
You should now be getting your AOL mail automatically.
I hope that was helpful.
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