AOL is a big provider - as well as comcast.net and some other companies, I know a few people with netscape.net as their email and what not - My suggestion is to find the bigger/more popular internet providers, and allow access to their email accounts as well - And maybe a place on your site, for people to send in a request for allowance of an email (if you dont have it or something)
Just what popped into my head
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