Fixed: FS#3336 - Underscore shouln't be possible in DNS entries!

Till Brehm

2014-02-15 91bb612618f7f5c32c6c58ac4833f575e15a16db

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auth    required   pam_mysql.so user={mysql_server_ispconfig_user} passwd={mysql_server_ispconfig_password} host={mysql_server_ip} db={mysql_server_database} table=mail_user usercolumn=login passwdcolumn=password crypt=1
account sufficient pam_mysql.so user={mysql_server_ispconfig_user} passwd={mysql_server_ispconfig_password} host={mysql_server_ip} db={mysql_server_database} table=mail_user usercolumn=login passwdcolumn=password crypt=1