Computers that have the Edge Transport server role installed handle all Internet-facing mail flow and provide Simple Mail Transfer Protocol (SMTP) relay and smart host services for the Exchange organization.

• 安装边缘传输服务器角色的计算机可以处理所有面向Internet的邮件流,并将为Exchange组织提供简单邮件传输协议(SMTP)中继和智能主机服务。