Sorry, but this is right: this domain won't make much money for you. UKmail.us ?? That is like AmericanMail.nl - mixing two countries completely different from each other. Because all simple addresses are taken with free email services, you will get a few sign ups who don't mind about the .US and just fancy an email address with UKmail. However, we're talking about a small audience, so I doubt if the domain is worth a lot of money. UKmail.co.uk or UKmail.net or so would have been very very valuable, but combining it with .US is a bit of a turn-off I'm afraid. I think maximum a few ten $$$