If the user has your address in their address book the mail will get through (AOL). It is all part of the spam filtering. I am not really sure the spam filter works that well since I get about 100 a day
No, nothing was sent to you. I've just noticed a lot of emails coming back lately like Forum Registration, Lost Password, order confirmations ... etc.
I'm used seeing to the 'unknown user' or 'unknown host' emails. You'd be surprised how many people either don't know their own email address or misspell their ISP. These are emails that AOL has refused to deliver.
If you do a Google search for 'AOL Blocking Email' you'll see there's a lot of complaints against them for things like this.