Applies to: Exchange Server 2007
Topic Last Modified: 2007-06-15

Use the Blocked Addresses tab on the IP Block List properties to manage a list of specific IP addresses for which e-mail messages are always blocked by the Connection Filter agent. If an originating IP address matches an IP address or IP address range on the IP Block list, the Connection Filter agent disconnects the Simple Mail Transfer Protocol (SMTP) session after all RCPT TO: headers in the message are processed.


To add IP addresses to the IP Block addresses list, click Add, and then select one of the following :

  • IP Address   Add a specific IP address. For example,

  • IP and Mask   Add an IP address and mask. For example, IP=; and Mask=

  • IP Range   Add a range of IP addresses. For example, Start Address=; End Address=

For more information, see the following topic:


To remove an IP address, select an IP address from the Remote IP Address(es) list, and then click Remove icon.


To save your changes without closing the tab, click Apply.

For More Information

For information on connection filtering and IP Block list functionality, see the following topics: