Cosa devo fare qundo si visualizza questi errori?

Warning: mail(): "sendmail_from" not set in php.ini or custom "From:" header missing in C:\Programmi\Apache Group\Apache2\htdocs\modules\Your_Account\index.ph p on line 119



Warning: setlocale(): Passing locale category name as string is deprecated. Use the LC_* -constants instead. in C:\Programmi\Apache Group\Apache2\htdocs\modules\Downloads\index.php on line 962