Fix for gentoo: http://www.howtoforge.com/forums/showpost.php?p=321184&post...

Till Brehm

2014-11-06 d907c0ce889a71b1ac5fb49e8dd5229b9459bd0e

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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