using wp_schedule_event

I’m developing a plugin that uses wp schedule event, but I can’t get it to fire. Here’s my code:

function more_reccurences() {
return array(
'everyminute' => array('interval' => 60, 'display' => 'Once Every Minute'),
);
}
add_filter('cron_schedules', 'more_reccurences');

register_activation_hook(__FILE__, 'mails_activation');
add_action('mail_event', 'check_for_mails');

function mails_activation() {
	wp_schedule_event(time(), 'everyminute', 'mail_event');
}

function check_for_mails() {
	global $wpdb;

	$message = "Line 1\nLine 2\nLine 3";
	$message = wordwrap($message, 70);
	mail('[email protected]', 'My Subject', $message);

}