add_filter('wp_mail_from', 'new_mail_from');
add_filter('wp_mail_from_name', 'new_mail_from_name');

function new_mail_from($old) {
 return '[email protected]';
}
function new_mail_from_name($old) {
 return 'Your Blog Name';
}

rainydaymedia.net

Add to the bottom of the your theme's function.php file. Change to your site's name

Change Wordpress default FROM email address

email, php, wordpress

PHP