Nếu địa chỉ IP được liệt kê ở đây, máy chủ SMTP sẽ được phép kết nối và truyền tải tin nhắn e-mail để tổ chức Exchange 2007, nhưng các tin nhắn e-mail sẽ được gửi đến các đại lý Tên người gửi lọc để chế biến tiếp. | 350 Chapter 7 Managing the Edge Transport Server Note You can specify individual IP addresses as well as a range of IP addresses under the Allowed Addresses tab on the IP Allow List Properties page see Figure . Figure The IP Allow List If the IP address is listed here the SMTP server will be allowed to connect and transmit e-mail messages to the Exchange 2007 organization but the e-mail messages will be sent to the Sender Filtering agent for further processing. If the IP address of the SMTP server isn t listed on the IP Allow list the Connection Filtering agent will check to see whether the server is listed on the IP Block list shown in Figure . If the IP address of the SMTP server is listed on the IP Block list connections from the server will be refused. Managing the Edge Transport Server Chapter 7 351 Figure The IP Block List Note A neat little improvement to the IP Address Block list is that you now can set an expiration date and time for an individual IP address or a range of IP addresses. This was not possible with Exchange Server 2003 SP2. If the IP address of the SMTP server isn t listed on either the IP Allow list or the IP Block list the Connection Filtering agent will check to see whether the IP address is allowed by any IP Allow list provider you have specified see Figure . Figure IP Allow List Providers 352 Chapter 7 Managing the Edge Transport Server An IP Allow list provider is a provider that maintains a list of sender domains IP addresses that you can rely on for sending legitimate e-mail messages and not can specify multiple IP Allow list providers and even specify how the providers features should interpret the returned status. If the SMTP server isn t listed on any of these lists the Connection Filtering agent will do one last check before it allows the SMTP connection. It will check whether the server is listed on any real-time block lists RBLs you have specified under the
