SouthernBelle is right about the above Remy. Your password is only ever sent to your email account and the one reason someone would do such a thing is to make you nervous about the security of your account details. I have had many people use the link on my names and no one is able to get the information because my emaill addresses are secure. As for the security of free web based emails, if you log out AFTER you're done using it that helps-many people just do something else in the window and that leaves their accounts open for trouble. I am referring to email accounts, NOT your Best Board's user name account.
Unfortunately I am not sure that changing the password back to the old one will work since the main server would see the new one and the others see the old one-it's complicated and last night when I advised someone to do this (change a new password back) it didn't help. I am not sure if the person had one character in the old password wrongly or what. But there is a chance even changing it back will not help. I haven't had a moment to test this myself with another name, so until I have I don't know that it really will help.