Symantec 10490452 Administration Guide - Page 96
Use the Sender Reputation Service, Define Allowed Senders
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96 Configuring email filtering Managing Email Firewall policies Symantec Mail Security for SMTP lets you customize spam detection in the following ways: ■ Define Allowed Senders Symantec Mail Security for SMTP treats mail coming from an address or connection in an Allowed Senders List as legitimate mail. As a result, you ensure that such mail is delivered immediately to the inbox, bypassing any other filtering. The Allowed Senders Lists reduce the small risk that messages sent from trusted senders will be treated as spam or filtered in any way. ■ Define Blocked Senders Symantec Mail Security for SMTP supports a number of actions for mail from a sender or connection in a Blocked Senders List. As with spam verdicts, you can use policies to configure a variety of actions to perform on such mail, including deletion, forwarding, and subject line modification. ■ Use the Sender Reputation Service By default, Symantec Mail Security for SMTP is configured to use the Sender Reputation Service. Symantec monitors hundreds of thousands of email sources to determine how much email sent from these IP addresses is legitimate and how much is spam. The service currently includes the following lists of IP addresses, which are continuously compiled, updated, and incorporated into Symantec Mail Security for SMTP filtering processes at your site: ■ Open Proxy Senders IP addresses that are either open proxies used by spammers or "zombie" computers that have been co-opted by spammers. ■ Safe Senders IP addresses from which virtually no outgoing email is spam. ■ Suspected Spammers IP addresses from which virtually all of the outgoing email is spam. No configuration is required for these lists. You can choose to disable any of these lists. ■ Incorporate lists managed by other parties Third parties compile and manage lists of desirable or undesirable IP addresses. These lists are queried using DNS lookups. When you configure Symantec Mail Security for SMTP to use a third-party sender list, Symantec Mail Security for SMTP checks whether the sending mail server is on the list. If so, Symantec Mail Security for SMTP performs a configured action, based on the policies in place.
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