Whitelists for email going to hotmail/msn/yahoo?

Folks, My company is currently exploring getting on AOL's email spam whitelist since we do send a large amount of email, but it is all requested by the people that get it (confirmation of bill payments/financial transactions). Are you aware of any of websites (like AOL's postmaster site) or whitelists for Hotmail/MSN, Yahoo, and other large email providers? Thanks, Mike