Believe it or not that is against the rules! I found out the hard way when I emailed a question about my Hilton emiles account. I waited days to hear back from them and got no response. Next thing I know my Award Wallet account could not log into the other accounts.

I say "other accounts" because I too had sponsored accounts from United/Hilton/US Airways/Alaska Airlines. All under different email addresses but all had my same mailing address.

I could no longer log into these accounts! All were closed down. I kept watching for an email from them telling me they "caught" me and closed down my accounts, but never got anything explaining they were being closed!!

I still have my MP and OnePass accounts. For some reason they didn't catch those. I did not email again since I didn't want those closed down. And it was after this that I actually read the T&C that said you could only have ONE sponsor account!!!