hash buster
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hash buster


Show me everything on Spam and virus protection

DEFINITION - A hash buster is a program that generates a string of text for insertion in a spam message so that, to a spam filter, the e-mail appears to be a different message each time it is sent. The text might appear in the Subject line, its From line, or after the message body, and might either be coherent text or gibberish. The latter is sometimes arranged in word-like formations to be less easily detected.

The hashing process, used by some spam filters, represents each message as a single number (known as a hash) to simplify comparison. Each number is then compared to those of other messages to determine if it matches a list of known spam messages or enough other messages to determine bulk e-mail status. However, a hash buster is only effective for spam filters that rely solely on hash comparison, and most such programs combine a number of approaches.

Learn more about Spam and virus protection
Securing your Exchange Server 2007 journaling archives: With work, journaling can be used to archive email in Exchange Server 2007. Get an understanding of how to create a tamper-resistant journaling mailbox.
Microsoft Exchange Server security dos and don'ts: Securing Exchange Server against spam and viruses is a challenge. Follow these security practices to protect Exchange from various email security threats.
Controlling spam in Exchange 2007 at the edge transport server level: There are many ways to control spam and viruses in Exchange 2007. Do you know how they work? Eliminating spam at the right server level is essential.
Securing your Exchange Server 2007 journaling archives: With work, journaling can be used to archive email in Exchange Server 2007. Get an understanding of how to create a tamper-resistant journaling mailbox.
Microsoft Exchange Server security dos and don'ts: Securing Exchange Server against spam and viruses is a challenge. Follow these security practices to protect Exchange from various email security threats.
Secure Edge Transport servers using the Security Configuration Wizard: Find out how to extend Windows Server 2003's Security Configuration Wizard in Exchange 2007 to protect Edge Transport servers from email viruses and spam.
The six-layered secret of effective Exchange Server email filtering: Discover the six key message-filtering layers that best block spam and viruses and keep unwanted email out of your Exchange 2003 or Exchange 2007 system.

LAST UPDATED: 29 Jan 2006

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More resources from around the web:
- The Suespammers Project list explains hash busters.
- SearchEnterpriseLinux offers a Tip about User spam control.





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