Introduction to Innovative Mail Filtering with AXIGENBy: Oana Raileanu
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Introduction to Innovative Mail Filtering with AXIGEN
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1. The problem with electronic mail today
Email is not what it was supposed to be. Its inventors have not foreseen the dan¬gers associated with this new form of communication. Means of protection were added later on, but do little to protect people’s mailboxes. As a result, most of the mail traffic these days is unwanted: spam, malware, phishing. How can we use the AXIGEN Mail Server and existing free anti-spam, antivirus and anti-phishing software and technologies so that the result is more than the sum of the parts?
2. Traditional filtering in AXIGEN
From its very beginnings, AXIGEN has integrated open-source filters such as SpamAssassin and ClamAV and has used the fastest way to process mails through them by interfacing with their daemons directly. But this usage scenario had a major downside: mail messa¬ges were scanned in the queue, after having been accepted by the mail server. As a result, “Spam” folders had the tendency to grow indefinitely and waste space in the server storage and backup mediums.
3. A new approach to email filtering
Starting with version 6.2.2, AXIGEN can integrate with a Milter filter at the SMTP level, enabling scanning of the incoming SMTP connections. The possibility to scan a message before receiving it opens up new perspectives, as it enables us to refuse a message if the content filters strongly indicate that the scanned message is unwanted.
Let’s take a simple example, in which the decision to reject a mail was taken by the Milter filter by evaluating the results of the antivirus scanner. Why would this be a better choice than quarantining, for example, or tagging?
For one thing, we do not accept the message and no further resources are allocated to this mail: processing, storage, backup, double-checks etc. For unwanted traffic, this is a very good thing as it minimizes your problems. However, what happens if, unfortunately, the refused message is a legitimate mail? Let’s compare the three valid choices: quarantining, tagging or refusing the message.
- Quarantining means that the unwanted mail would end up in a rather large quaran¬tined space. Suppose we only do this for malware as detected by an antivirus con¬tent filter: viruses, worms, phishing. Can we alert the receiver for every quar¬an¬tined mail that was heading to their inbox? Realistically, no, because the mal¬ware traffic can reach really high levels. Add to this that almost all of it is spoofed and you risk to get into situations in which innocent people are blamed for spreading malware, when their only fault would be the fact that their address is known by spammers. So, when a mail is quarantined, neither the sen¬der, nor the recipients are usually aware of it. If through some other means one or both of them find out about the missing mail, typically the receiver will have to alert his/her administrator of the mishap in order to gain access to the quarantined mail.
- Tagging, often applied to spam messages, means the message will usually end up in a sub-folder of the recipient’s mailbox, typically named “Spam”. He/she may or may not check that folder for false positives, but as no filter is perfect, sooner or later some legitimate mail will end up in “Spam”. When that happens, neither the sender, nor the recipient will be aware of it. If through some other means, one or both of them find out about the missing mail, the receiver will usually have to dig through its spam folder to find the legitimate mail. This may be quick if he/she knows the exact coordinates of that mail (sender, date, subject), or may be a daunting task if the “Spam” folder is rather large and the data is very vague (eg. "Should have received a mail from a South American company with some financial info").
4. To learn more about our innovative, Milter-based filtering, please visit: http://www.axigen.com/articles/innovative-mail-filtering_51.html, or contact us at sales@axigen.com. We also invite you to sign up to our free, live webinar organized in partnership with the The Radicati Group: http://www.axigen.com/webinars/linux-messaging/http://www.axigen.com/articles/introduction-to-innovative-mail-filtering-with-axigen_51.html |
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| Keywords |
AXIGEN, mail, server, mailserver, email, filtering, email filtering, mail filtering, Milter, SpamAssassin, ClamAV, MIMEDefang, virus filtering, spam filtering, messaging, secure mail server |
| Category |
Computers and Technology |
| Submission Date |
Dec 8, 2010 |
| Article Contact Name |
Oana Raileanu || send email to Oana Raileanu
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Other links at Computers and Technology |
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One method of thinking about designing a new website is to use a mind mapping process, or to draw up a spider diagram. I wouldn't name the website here, but I know well about them because I was trying to compete with them for most competitive keywords "web design company" and "web designing company" If you doubt that these keywords are so competitive, I would like you to have a look at this great tool which would tell you how competitive a keyword and a phrase is, it's fun to play with. When designing your website or any promotional material, make sure you use language that all your customers understand. Design depends on individual taste and designing a website from a first draft that the client will like from the start, can be a real challenge.
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Industrial Computers
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There’s always a need of computing whether it’s manufacturing or office sector. Industrial computers have taken a lead in this concept. Many automated manufacturing process are controlled by these computers such as application like stock control and dispatch however their needs are quite a different one.
Industrial PC’s always run in a lot of different environment to that of the needs for an office computer but it needs condition like nicely air-conditioned suites, free from dust, water to be more reliable. With varying needs Industrial PC’s used in food manufacture may have to be waterproof and intrinsically sealed to prevent explosions in potentially explosive and dusty atmospheres whilst also being made of stainless steel or other easy to clean material; yet computers in heavy industry may have to also protect from dust and dirt but be able to withstand excessive temperatures, knocks and vibrations.
It’s the matter of fact that Industrial motherboards need to be tougher than normal motherboards found in personal computers or laptops. Being used in tougher conditions than standard computer motherboards, industrial motherboards, like industrial LCD displays or Industrial LCD touch screen need to be able to cope with higher temperatures which need to be tougher in case of a shock or a hit.
Devised to safeguard fragile computer equipments, industrial computer systems like Rackmount system and embedded system is one of the suitable options for businesses, home and office aimed at making your work convenient, well thought-out, and creative. These systems posses unique features such as, durability, ease of installation, light weight, reliability and high quality.
These systems are becoming more and more important in today's world as they control almost all of the communication, computing, display and any other electronic device that we can think of. Industrial computer systems span across all aspects of modern life whether it be education, entertainment, communication or science. These systems are dedicated to specific tasks, so embedded design engineers need to optimize it, reducing the size and cost of the product, and increasing the reliability and performance.
Industrial computers are specifically designed to reliably operate in harsh usage environments and conditions, such as strong vibrations, extreme temperatures and wet or dusty conditions. They are designed from inception for the type of rough use typified by these conditions; commercial units upgraded for this purpose make poor substitutes. With unmatched reliability features industrial computers are laced with redundant mirror hard drive and long life power supplies too.
http://www.corvalent.com
18655 Madrone Parkway, Building 180
Morgan Hill, CA 95037 USA
Toll-Free +1 888.776.7896
Phone +1 408.776.7896
Fax +1 408.776.7496
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