nsj
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Stopping more unwanted mail earlier - Introducing three additional ways to improve your mailflow.
no.Spam.java already offers a number of advanced mail screening filters to help prevent unwanted mail from reaching your users, now we offer three more. One of our aims with nsj is to try to detect as much unwanted mail as easily in the mail delivery process as possible, thus reducing the need for CPU and memory intensive scanning of the content. Two of these new features do just that.
Greeting rules
Whenever a server connects to yours to send mail it first offers a 'greeting'. Spammers often try to trick your e-mail server into thinking that they are one of your own servers connecting by sending a familiar greeting - the practice is termed '
helo
spoofing
'. A new nsj filter called 'checkConnection' not only checks the syntax of a greeting but allows you to create personal rules to allow or reject certain greetings. It's easy to reject spoofed greetings or those that do not comply to mail standards. Many mail '
zombies
', or home pc's that have been taken over by a malicious
worm
or
virus
will attempt to send mail using your own mail domain as their greeting. This filter will stop them in their tracks!
Connection checks
In addition to checking for the greeting, nsj can also now perform a number of tests on the connecting servers credentials to determine if the server is who it says it is. Servers who connect claiming to be part of a mail domain that they're not registered in will be rejected. Once again,
zombies
and other illegitimate servers are easily stopped by using this technique. Of course you can exclude any servers that you know are valid but for the most part you won't need to worry about doing this.
Web beacons
Web beacons are identifying marks built into image links that display images from a web server. The owner of the server can determine, from the requests sent for the image, who has opened the mail message. Normally this will just confirm that an e-mail address is valid but it can also be used for tracking, statistics and can potentially disclose information about you that you may not necessarily have sanctioned. nsj is able to render these beacons useless so they won't operate.
To use any of these new features, simply make sure that you are using the latest nsj version and contact DRCC so we can help you configure the new filters. Adding the filters and the configuration changes will take about 5 minutes.
Remember,
no.Spam.java
is a powerful and flexible, Java based, secure e-mail proxy with many advanced features that you'd normally have to pay an enormous sum for. You can use nsj on almost any popular computing platform and with any existing SMTP server or POP e-mail client.
For a free 30 day trial of nsj, please contact DRCC at sales.support@drcc.com. We'll be happy to ship you a fully functional evaluation kit and even assist you with configuration and support during your trial.
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spam@drcc.dyndns.biz
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