Before using the self-built mail, the mail server in local companies, because want to go to the tencent enterprise email now, to allow access to dozens of related domain name (exmail.qq.com), but the client cannot access without permissions in the morning, will not be able to send and receive E-mail, but cannot open Internet access, all can be mapped to a network using the domain name, or use any other method or related equipment for network computer use, company with H3C ER5200 routing, thank you first!