/etc/courier/authmysqlrc Make the following changes in this file if you are utilizing MySQL: MYSQL_SERVER localhost MYSQL_USERNAME courier MYSQL_PASSWORD (your choice) MYSQL_SOCKET /tmp/mysql.sock MYSQL_PORT 3306 MYSQL_DATABASE courier-mail MYSQL_USER_TABLE users MYSQL_CLEAR_PWFIELD clear DEFAULT DOMAIN (your domain) MYSQL_QUOTA_FIELD quota If you utilize PAM: cat > /etc/pam.d/esmtp << "EOF # Begin /etc/pam.d/esmtp auth required pam_unix.so try_first_pass account required pam_unix.so session required pam_unix.so # End /etc/pam.d/esmtp EOF cat > /etc/pam.d/pop3 << "EOF # Begin /etc/pam.d/pop3 auth required pam_unix.so try_first_pass account required pam_unix.so session required pam_unix.so # End /etc/pam.d/pop3 EOF cat > /etc/pam.d/imap << "EOF # Begin /etc/pam.d/imap auth required pam_unix.so try_first_pass account required pam_unix.so session required pam_unix.so # End /etc/pam.d/imap EOF cat > /etc/pam.d/webmail << "EOF # Begin /etc/pam.d/webmail auth required pam_unix.so try_first_pass account required pam_unix.so session required pam_unix.so # End /etc/pam.d/webmail EOF