There is a history of AOL blocking email willy nilly. If a domain has been used to send spam then AOl will block it . Its always worth having something like a hotmail account. Alternatively register your own domain (on someone like 1and1) and then set up as many addresses as you want, forwarding them to your AOL account. Also useful to register with websites. Set up a specific email address and then only use that on that one website. If the address is compromised and you start getting spam, just get rid of it and use another!