Hi I installed prefect install SUSE 10.1 + ISPConfig + webmail/phpmyadmin (thru update manager ) In ISPConfig -> System Config I changed: User Prefix: [DOMAIN]_ In ISPConfig -> Settings -> Email I checked Maildir option. Then I create new client and new site. I made new User & email : email: email@example.com password: mydomain.com_info Now whenever i try to login with that username to: http://www.mydomain.com:81/webmail I always get invalid username/password error. ( Same with outlook express client) I also cant log in to FTP server. Before I changed User Prefix to: [DOMAIN]_ I could log in to FTP only email did not work. I deleted all resellers/clients//sites/users before I change User Prefix. Please help me out.