Fixed regex for email filed to allow _ in email addresses.

tbrehm

2010-06-30 0f7d3e2306acbdf618ed2a2d48d1c8cf3457fd87

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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=email 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=email passwdcolumn=password crypt=1