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E-mail has become an indispensable work tool for an overwhelming majority of businesses.
Victim of its own success, it has also turned into a trap harboring threats that just continue to grow in number.
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Spam (unsolicited e-mails) is a nuisance that, by its sheer volume, disrupts the daily routine of e-mail users.
It is no longer uncommon to see your inbox flooded with undesirable e-mails. The time wasted on sorting them out is significant and adversely affects productivity.
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Solutions that protect against spam therefore need to solve this problem effectively, while ensuring at the same time that legitimate e-mails do not get deleted or blocked in the process.
HIGHLIGHTS - ANTI-SPAM
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Netasq's solution |
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Different technologies make it possible to fight this bane, but with varying degrees of success. To effectively meet the needs of large and small business, NETASQ’s solution combines several analyses in order to draw the best from each of them, and matches the identity of the sender with the content analysis of the e-mail.
Spam sources are identified by querying blacklist servers through the DNS protocol in order to optimize performance.
NETASQ assigns each pre-selected blacklist server with a reliability index that allows the administrator to calmly select the servers to query. Of course, additional servers can be added according to individual needs.
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Effective technology |
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Despite this technology being very effective, it is based only on the identification of mail servers that allow the sending of undesirable mail. Certain public mail servers that belong to reputable companies are used by spammers to relay their attacks. Unfortunately, a large number of users (webmail, different providers, etc) also use these servers.
For this reason, NETASQ maintains a whitelist of servers which are not analyzed by the DNS. This list is regularly updated on NETASQ appliances, in order to prevent the occurrence of many false alerts (false positives).
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A powerful engine |
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To make this analysis complete, NETASQ now embeds an engine for analyzing e-mail contents. This engine, a product of Goto Software’s Vade Retro technology, is embedded in NETASQ appliances, thereby dispensing with the need for access to a remote server.
Several thousand heuristic analysis rules are embedded in the engine, which analyze both the body of the message and its header. These rules make possible to determine the probability of a given message being desirable or not. Depending on this probability, NETASQ will then assign a reliability index to the message, reflecting the probability of the e-mail being undesirable.
Different tests carried out by ISPs have shown that the analysis engine blocks up to 99% of undesirable e-mails.
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Ease of use and administration |
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By this combination of unique technologies, NETASQ’s antispam guarantees maximum effectiveness while avoiding the risk of losing valid messages.
All these analyses are done in parallel, with no impact on the server configuration, in order to maximize the ease of use. A specific tag defined by the administrator is added to the message of an undesirable e-mail, or more simply, the headers are modified according to a format that is recognized by main e-mail clients.
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