使用php开发的一个邮件代理发送系统，为防止收件邮箱将本系统发出邮件作为垃圾邮件放入垃圾箱，设置间隔时间段进行邮件发送。-Send an e-mail using the php development, in order to prevent the recipient mailbox of the system to issue e-mail into the trash, set the interval time to send messages as spam.