||AOL are the only ISP that do not support emails from other domains. So while with AOL you would be able to receive emails from your website email address, but NOT be able to reply on that email address, you would need to reply from your AOL email address.
If you switched ISP to anybody else; Virgin, Freeserve, BT, NTL, etc. You would be able to send and receive from the websites email address.
AOL are the only Internet company, let alone ISP, that do not use a MAPI system for emails. I won't pretend to understand it, but my AOL clients have to either switch to someone like Freeserve, or just use their AOL email address on the website.
However, I can now arrange suitable hosting packages with smtp services. It can be a little slower than traditional means. But clients can have their website hosted and be able to send and receive emails from their website email address.