qmail mail works... sortof

I have qmail set up. I can get email on one user adn send email. for some
reason I can't with any other user including postmaster. I get an
authentication error. I can't get into sqwebmail at all. It won't
authenticate with any user. Does any one have any idea where I need to
start looking for this problem? I have gone through all of the config
files over and over and I can't see what would be causing this. I have
deleted and recreated the domain. I don't understand why it would work for
one user but not for any other users. Any help will be greatly
appreciated.

Thank you,
mAineAc