PHP邮件程序不向特定组发送邮件

Question

使用PHP邮件发送电子邮件。对于个人用户和某些群组，我能够发送邮件但是对于其他一些群组，邮件不会发送。使用Microsoft Exchange服务器收发邮件。并且没有显示错误在主机的日志文件中。

PHP邮件代码：

@available(iOS 9.0, *)
    override func previewActionItems() -> [UIPreviewActionItem] {
        let action2 = UIPreviewAction(title: "Últimos 5 dias úteis", style: .Default) { (action, viewController) in
           self.delegate?.balanceViewControllerFilterDidSelected(.FiveDays)
        }
        let action3 = UIPreviewAction(title: "action", style: .Default) { (action, viewController) in
            self.delegate?.balanceViewControllerFilterDidSelected(.FiftyDays)
        }
        let action4 = UIPreviewAction(title: "action", style: .Default) { (action, viewController) in
            self.delegate?.balanceViewControllerFilterDidSelected(.ThirtyDays)
        }
        let action5 = UIPreviewAction(title: "action", style: .Default) { (action, viewController) in
            self.delegate?.balanceViewControllerFilterDidSelected(.SixtyDays)
        }

        return [action2, action3, action4, action5]
    }

提前致谢。