I have a multi-site account with my server host. It's actually a reseller account that allows me to sell and set up an unlimited number of domains within my server space. However, I don't resell any accounts. I have several set up for myself (hornerfamily.com, donhorner.com. betsyhorner.com, etc.) and have set up domains for each of my kids, for my daughter's high school band, for my brother-in-law's travel videos, and for a friend's real estate business. The last one is the closest to a resold account; she pays me to set up and maintain her entire site and leep the listings, etc. up to date. (I get all of this for about $23 per month paid annually from
Page-Zone).
I also purchased a domain name just to have an anonymous mail server. It's registered through a private proxy registrar and GoDaddy.com so no one can determine the actual owner of the domain, and I have set up server space for it. I don't use this site for anything except receiving email anonymously. I can set up any number of email accounts to 150; if anyone is interested in a totally anonymous address, PM me and I'll provide the details. On second thought, it wouldn't be totally anonymous, I'd have to set it up, and therefore I'd know your password and would be able to intercept your mail, if I was interested, which I'm not, but I could be, so I guess if you're paranoid enough to need an anonymous address, you're too paranoid to do it through me.
The best part of having all those domains and nearly unlimited email accounts under each domain is that I can have as many different email addresses as I want. I'm likely to set one up in order to register in some site that has to verify an account, then never bother to check it again. Maybe once a year I look at them and clean them out if the fill with spam. A couple of times, my server sent me warnings that one account or another is getting too full.
The interesting thing is, every account automatically has a catch-all account that collects mail sent to bogus names at that account. Every once in a while I look at that catch-all account for one domain or another. They are addressed variously to "info@...", "mail@...", "webmaster@...", "accounting@..." and dozens of other names that are typically used at any web site.