Antispam
In each system, which involves the communication of users, there is always the problem of spam, or the mass mailing of unsolicited emails, which is solved using the antispam system. An antispam system is installed to catch and filter spam at different levels. Spam monitoring and identification are relevant on corporate servers that support corporate email, here the antispam system filters spam on the server before it reaches the mailbox. There are many programs that help to cope with this task, but not all of them are equally useful. The main objective of such programs is to stop sending unsolicited letters, however, the methods of assessing and suppressing such actions can be not only beneficial but also detrimental to your organization. So, depending on the rules and policies of mail servers, your server, or even a domain, may be blacklisted and the transfer of letters will be limited through it, and you may not even be warned about it.
The main types of installation and use of anti-spam systems:
- installation of specialized equipment, a gateway that filters mail before it reaches the server;
- use of external antispam systems for analyzing emails and content;
- setting up an antispam system with the ability to learn on the mail server itself;
- installation of spam filtering software on the client’s computer.
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F.A.Q. about Antispam
Anti-spam technologies:
Heuristic analysis
Extremely complex, highly intelligent technology for empirical analysis of all parts of a message: header fields, message bodies, etc. Not only the message itself is analyzed. The heuristic analyzer is constantly being improved, new rules are continuously added to it. It works “ahead of the curve” and makes it possible to recognize still unknown varieties of spam of a new generation before the release of available updates.
Filtering counteraction
This is one of the most advanced and effective anti-spam technologies. It is to recognize the tricks resorted to by spammers to bypass anti-spam filters.
HTML based analysis
HTML code comparable to samples of HTML signatures in antispam. Such a comparison, using the available data on the size of typical spam images, protects users from spam messages using HTML-code, which are often included in the online image.
Spam detection technology for message envelopes
Detection of fakes in the "stamps" of SMTP-servers and in other elements of the e-mail header is the newest direction in the development of anti-spam methods. Email addresses can not be trusted. Fake emails contain more than just spam. For example, anonymous and even threats. Technologies of various anti-spam systems allow you to send such messages. Thus, it provides not only the economic movement, but also the protection of employees.
Semantic analysis
Meaning in words and phrases is compared with typical spam vocabulary. Comparison of provisions for a special dictionary, for expression and symbols.
Anti-camming technology
Scamming is probably the most dangerous type of spam. All of them have the so-called "Nigerian letters", reports of winnings in the lottery, casino, fake letters and credit services.
Technical spam filtering
Automatic notification of e-mail - bounce-messages - to inform users about the malfunction of the postal system (for example, non-delivery of address letters). Attackers can use similar messages. Under the guise of a technical notification, computer service or ordinary spam can penetrate the computer.
Materials
Antispam system
http://it-dopomoga.kiev.ua/antispam-sistema/Antispam
https://products.drweb.ru/antispam/