Which creates a rule under the name CUSTOM_RULE and searches for the word “sale” in lowercase in the body of the email. Rules should be added to the /opt/zextras/conf/salocal.cf.in file as follows: body CUSTOM_RULE /sale/ It uses Perl regular expressions and looks for specific content inside the email. Rules consist of test criteria and a score followed by a description (the description is not mandatory). If the email’s total score exceeds a predetermined limit, it is tagged as spam or deleted if the points are above a certain level. This is done by assigning points to an email based on the number of rules met. SpamAssassin evaluates emails by analyzing their headers and body, according to rules such as certain words or phrases. There are also checks, during the passage of which spam points are deducted. The same happens in cases where the letter contains other signs typical for spam mailings. For example, if an email starts with the word Dear, SpamAssassin automatically adds one spam score to it. The way SpamAssassin works is simple – each incoming mail message is subjected to a whole series of checks, and each time it passes, the letter is assigned spam points. It starts filtering incoming mail immediately based on its built-in dictionaries. SpamAssassin is installed with Carbonio CE and is enabled by default. ![]() SpamAssassin can block important emails or miss potentially critical ones if configured incorrectly. This article shows how an administrator can set up SpamAssassin, one of the most advanced mail-filtering solutions, to filter spam, in Carbonio CE servers. If it enters the user’s mailbox, it begins to take up space in the mail server’s data storage, and a business letter can simply be lost in useless spam. In addition to the obvious risks to the information security of the enterprise, spam also creates a significant load on the mail server. Despite the emergence of numerous instant messengers, it is email that is by far the most inexpensive way to send information, and given that emails support attachments in the form of files and embedding HTML scripts, it is email that is extremely often used to send spam.
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