Hi not sure you understand what i mean, each domain may have hundreds of separate user pop account which could also have a webspace account like this www.user.domain.com the web space would not be a fully functional account i.e add remove more email accounts and will probaly not have free use of cgi-bin only use of pre-installed scripts.

Initially the user would search for their desired email address on selected domain, if this was available they would then use a credit card to pay for use of email address pop only or pop and webmail plus web space option if required.

like mailbank.com but with web based mail.

cheers