/**
* Checks configuration to conclude if EmailService is usable.
*/
public static function canUse()
{
if (isset(self::$_canUse) === false && (self::$_canUse === true || self::$_canUse === false)) {
return self::$_canUse;
}
$canuse = EmailConfiguration::canUse();
if (strtolower(trim($canuse)) === 'production') {
$canuse = ApplicationConfiguration::isProductionInstance();
}
if ($canuse !== true && $canuse !== false) {
$canuse = false;
}
self::$_canUse = $canuse;
return self::$_canUse;
}