Please make a detailed post about your problem. Just saying "I can't figure out the e-mail address thing" doesn't enable us to help you, since we have no idea what exactly your problem is.
There are stickies (the first 4 or 5 posts in this forum) that should answer all your questions. We've been getting a lot of e-mail questions recently. :)
My email address is not a free email but my website is hosted by Yahoo! - I pay for the hosting and the email addresses... but SW Combine sent me a reject saying that noah@noahmoyer.com is a free email address. Help!
I've been thinking about that for a while, Syn. Technically, if my friend owns a domain, then he could make me a admin@whatever.com email address. It wouldn't really prove that I own the domain. Technically, and if I had several computers with several different IPs, I could make at least two characters with webmaster@ and admin@. I just need to make the first with webmaster@, change the email in it to some gmail or whatever else, then, a bit later, sign up with admin@
Yes, you can use someone else's webmaster/admin account, Lawson, but you can't use it without the owner's consent.
Since a personal domain can only be used to register one account, that means the domain owner won't ever be able to register with their domain e-mail address in the future.
If they're willing to consent to that, we have no problem with it and it is a valid method of registering an account.
However, your registered e-mail is entirely separate from the preferred e-mail you set in your account settings - even if you change it to a gmail address, the original e-mail address will continue to be associated with your account and cannot be reused.
Also if someone creates an account with admin@ and then tries to join again (different IP) but with webmaster@ we can still catch it. For the comparison will show the other account; handle, email and 2 IPs (first join and last logged in)
It is how I get many people who join with an email that is mistyped and they try to join a second time.