SecurityGateway is a powerful email spam & malware filter & gateway that can be used to protect any type of mail server. It offers a layered approach to security, with protection features including data leak prevention, attachment filtering, heuristic and Bayesian analysis, zero-hour Outbreak Protection, and much more.
In today’s video tutorial, we demonstrate best practices for handling spam in SecurityGateway. Topics covered include:
How to mark a message as spam to teach the Bayesian learning process how to identify junk email messages, which helps to make the spam filter more accurate over time.
Are you receiving a lot of inbound email to MDaemon or SecurityGateway from a particular country?
Does your company do business with this country?
Do your email users only need to send and receive email within your own country?
If you run a small business and all of your clients and suppliers are local, then chances are you’re not going to be sending email to certain countries across the globe. Depending on the type of business, companies may want to block all incoming connections from these countries. This is especially useful because a lot of international email traffic contains spam, malware, phishing attempts, and viruses. Taking the time to deal with these types of messages can lead to lost productivity.
There’s an easy way to block these connections. In this video, I show you how to block mail by originating country using the DNS-BL features in MDaemon and SecurityGateway.
If you work in real estate, you are not likely to receive email with pharmaceutical-related content, and if you work in the medical field, you’re not likely to receive email about stock tips or account-related notifications from PayPal. With SecurityGateway, you can create content filter rules to filter out messages that contain words that are not relevant to your business. You can filter based on the sender, recipient, IP address, message subject, message body, or any header found within the message. I’ll show you how in the following brief tutorial video.
SecurityGateway is a software-based email gateway/firewall that can be installed in front of any Exchange or other SMTP mail server, allowing you to block malicious content, such as spam, viruses, malware, and phishing attempts, before it reaches your mail server. You can learn more about SecurityGateway here.
SecurityGateway and MDaemon both feature Bayesian learning, which allows administrators (or users, when authorized) to feed samples of spam and non-spam email messages to designated public folders. By default, when 200 samples of spam and 200 samples of non-spam have been placed in these folders, the Bayesian learning process will process these folders and feed their contents to a database of what are known as tokens – snippets of spam-like and ham-like (non-spam) content, basically. We all know that we humans are not infallible – people make mistakes, so it’s possible for messages to be fed to the wrong folders. When this happens, users may begin to receive more false-negatives (spam that was not caught by the spam filter) or you may accumulate a number of false positives (legitimate email messages that were flagged as spam by the spam filter). When this happens, it may be necessary to rebuild the Bayesian database. You may recall that I posted a blog entry awhile back on how to rebuild the Bayesian database for MDaemon. You can read that post here. For SecurityGateway, the concepts are the same, but the navigation and file locations are different. The following tutorial video explains how to rebuild the Bayesian database in SecurityGateway.