Symantec 10744983 Administration Guide - Page 112

112 Configuring email filtering Managing Email Firewall policies Method IP-based Third party services Domain-based Notes Specify IP connections. Symantec Mail Security checks the IP address of the mail server initiating the connection to verify if it is on your Allowed Senders Lists or Blocked Senders Lists. Wildcards are not supported. Although you can use network masks to indicate a range of addresses, you cannot use subnet masks that define non-contiguous sets of IP addresses (for example, 69.84.35.0/255.0.255.0). The following notations are supported: ■ Single host: 128.113.213.4 ■ IP address with subnet mask: 128.113.1.0/255.255.255.0 ■ Classless Inter-Domain Routing (CIDR) IP address: 192.30.250.00/18 Supply the lookup domain of a third party sender service. Symantec Mail Security can check message source against third party DNS-based lists to which you subscribe, for example, list.example.org. Specify sender addresses or domain names. Symantec Mail Security checks the following characteristics of incoming mail against those in your lists: ■ MAIL FROM: address in the SMTP envelope. Specify a pattern that matches the value for localpart@domain in the address. You can use the * or ? wildcards in the pattern to match any portion of the address. ■ From: address in the message headers. Specify a pattern that matches the value for localpart@domain in the From: header. You can use wildcards in the pattern to match any portion of this value. If you choose to identify messages by address or domain name, you can use the following examples: Example example.com [email protected] sara*@example.org [email protected] Sample matches [email protected], [email protected], [email protected] [email protected] [email protected], [email protected] [email protected], [email protected]