Hi, I've got following information in vpopmail-FAQ: ================================ 0. How can I set one virtual domain to be the primary domain for the machine? We don't want to have any /etc/passwd users. rm ~vpopmail/users ln -s ~vpopmail/domains/"virtual domain to use as primary domain" \ ~vpopmail/users This will allow users of the primary domain to set their pop user name to user instead of user%virtualdomain ================================ I done it with cdb authentication (i.e, vadduser "[EMAIL PROTECTED] user1" then authenticated by user name = user1). But I could NOT do it with mysql-authentication. I compiled vpopmail 3.4.11 with: ./configure --enable-mysql=y --enable-sqlincdir=/usr/local/mysql/include --enable-sqllibdir=/usr/local/mysql/lib I would appreciate some help! Thanks, Cuong