Our latest version of MDaemon, MDaemon 17, comes packed with lots of new features for administrators and end users, including new password security, support for Let’sEncrypt, DropBox integration, message scheduling, and much more. Today, I’d like to demonstrate MDaemon’s new Health Check utility. With this handy new tool, administrators no longer have to go through each feature to verify that it’s configured for optimal security. This new tool will analyze all security-related settings, display each setting’s current value, its recommended value, and where that feature is located in the MDaemon interface. This tool offers administrators the flexibility to change all settings to their recommended value at the same time, or to select and change individual settings. In this tutorial video, I demonstrate how to use the new Health Check utility.
In certain situations, it may be necessary to retrain your Bayesian Learning database. This can be necessary when spam messages are inadvertently placed in the Bayes non-spam folder, or when non-spam messages are placed in the Bayes spam folder.
To reset your Bayesian Learning and start training it again from scratch, you can perform the following steps:
1. Stop the MDaemon service.
2. Verify that the MDaemon executables (MDaemon.exe, CFEngine.exe, MDSpamD.exe, WorldClient.exe) have all exited memory using Windows task manager.
3. Rename the folder “/MDaemon/SpamAssassin/Bayes/” to”/MDaemon/SpamAssassin/Bayes.old/”
4. Re-launch MDaemon.
5. Go to Security | Spam Filter | Bayesian Classification, then click on the Learn button.
At this point, MDaemon recognizes that the Bayes folder isn’t there when the learn process is triggered, so it builds a new Bayes folder.
The Bayesian learning engine won’t process new messages until the administrator has taught it 200 spam and 200 non-spam messages. So even if an administrator were to manually press the Learn button OR have MDaemon learn automatically at midnight, the Bayesian engine wouldn’t apply itself to new messages even though the new folder is created.
Once MDaemon recognizes that Bayesian learning has learned more than 200 spam and 200 non-spam messages, it will start applying what it has learned to new messages.
You can run a script to determine how many messages the Bayesian filter has learned from. This will come in handy for administrators who need to know how many more messages to feed the Bayesian filter. This process is explained in this knowledge base article.
Recently, I wrote a post about teaching your MDaemon Inbox to recognize spam using the Bayesian learning feature. This feature helps to train the spam filter to be more accurate over time by feeding it samples of spam and non-spam messages. SecurityGateway also includes Bayesian learning features (in addition to many other security features designed to keep spam, viruses, malware and phishing attacks from hitting your mail server). Today, I’ll be explaining how to use these features to teach SecurityGateway how to get better at recognizing spam (false negatives – spam messages that were not filtered out) and non-spam (false positives – legitimate messages that were marked as spam).
Administrators must first enable and configure Bayesian learning in SecurityGateway before users will be able to use it. Follow these steps to enable and configure Bayesian learning.
Click on the Security tab, and then click on Heuristics & Bayesian under the Anti-Spam section.
Make sure the first box, “Use heuristic rules and Bayesian classification to analyze messages” is checked. This setting basically turns the spam filter on and is enabled by default.
Under “Location (all domains),” click on the link to configure SGSpamD. You can optionally select a domain in the drop-down menu at the top to configure these settings for a specific domain.
Under the “Bayesian Classification” section, check the first box to enable Bayesian classification.
By default, 200 samples of spam and 200 samples of non-spam are needed before Bayesian learning can take place. You can adjust this number in the blanks provided, but in most cases, this will not be necessary.
By default, Bayesian learning takes place at midnight each night. You can select the second option under the “Bayesian Learning” section if you’d like to schedule Bayesian learning more frequently, at regular intervals. This is useful if you have a larger number of messages to learn from. You can also select the third option if you do not want Bayesian learning to run automatically based on a schedule. When this option is selected, you can use the link at the bottom of the Bayesian Learning section to perform Bayesian learning as needed.
SecurityGateway needs to know where to find messages to be fed to the Bayesian learning engine. By default, messages are placed inside the C:/Program Files/Alt-N technologies/SecurityGateway/BayesSpam and BayesHam directories. You can optionally use a different path mapped to a different drive to improve performance.
In the following two blanks, enter the Spam and Non-Spam forwarding addresses. The default addresses are spamlearn and hamlearn, so if your domain is example.com, users can forward spam messages (as an attachment) to email@example.com to feed these messages to the Bayesian learning engine. This procedure is explained in greater detail later when we discuss how end users can submit spam and non-spam messages to the Bayesian learning engine.
Most spam messages are relatively small, thus, you can place a size limit on messages to learn from by checking the box “Don’t learn from messages larger than” and entering a value (in bytes) in the blank blow. Placing a size limit on messages to learn from helps improve the performance of the Bayesian learning engine.
You can automate the Bayesian learning process by enabling Automatic Bayesian Learning. By default, messages that score less than 0.1 are considered to be legitimate and only messages that score a 12.0 or above are considered to be spam for purposes of automatic Bayesian learning. Before enabling automatic Bayesian learning, I would recommend reviewing your message logs for false negatives and false positives and use their spam scores as guidelines for populating the spam and non-spam scoring thresholds. You can also optionally check the boxes to only learn non-spam messages from domain mail servers and authenticated sessions, and only learn spam from inbound messages.
Before I explain the next setting, I want to explain the concept of “tokens.” When the Bayesian learning feature “learns” from a message, it takes snippets of information from the message, such as words or phrases, and uses this information to create tokens. These tokens are accumulated and when a new message is scanned by Bayesian learning, its contents are compared to these tokens to look for similarities. Under the Bayesian Database section, check the box to enable Bayesian automatic token expiration. This helps to limit the token database to a manageable size, expiring old tokens and replacing them with new ones when the maximum number of Bayesian database tokens (specified in the blank below) has been reached. When this number of tokens is reached, the Bayesian system removes the oldest, reducing the number to 75% of this value or 100,000 tokens, whichever is higher. 150,000 tokens make up about 8MB of data.
Click Save and Close to save your changes.
End User Instructions
Now that SecurityGateway has been configured properly on the server, users can start feeding samples of spam and non-spam to the Bayesian learning engine.
There are two methods users can use to submit samples of spam and non-spam to the Bayesian learning engine in SecurityGateway. The first (and easier) way is to use the thumbs-up and thumbs-down icons in the SecurityGateway interface. The second way is by forwarding spam and non-spam messages (as attachments) to designated email addresses.
To mark messages as spam or non-spam using the SecurityGateway interface, follow these steps:
Log into SecurityGateway.
Click on My Message Log. This brings up a list of all of your inbound and outbound messages.
Click on the message you wish to mark as spam or non-spam, and then click on the Thumbs-up button to mark the message as non-spam, or the thumbs-down button to mark the message as spam.
You will receive confirmation that the message was marked as spam.
To feed messages to the Bayesian learning engine by forwarding them as attachments, simply attach the message to an email addressed to the designated hamlearn@ or spamlearn@ address for your domain (example: firstname.lastname@example.org). Note: SMTP authentication must be used.
If you are using WorldClient, you can right-click on the message and select “Forward as Attachment.” Then, populate the To: field with the spamlearn@ or hamlearn@ address and simply send the message.
When used properly, Bayesian Learning is a powerful tool for reducing spam and ensuring legitimate messages are not blocked by the spam filter. More information can be found in this knowledge base article.
Don’t let spam ruin your day. These tips can help you keep the bad stuff out of your Inbox so you can focus on your business!
Can you imagine what life would be like if we didn’t have anti-spam and anti-virus protection on our email servers and gateways? Users would be so flooded with spam, phishing attempts and malware that they’d have to scroll through many pages of email messages before finding a message that’s legitimate. A good anti-spam/anti-virus mail server or gateway will filter out the vast majority of this nonsense so that the end user can focus on his job.
Most mail servers have some form of built-in spam protection, however, administrators are often faced with these challenges
Not enough security features on the mail server to catch many of today’s evolving threats
The need for an extra layer of defense between the mail server and the internet
Lack of reporting features, which can be used to assess the effectiveness of your email security solution
Cumbersome configuration & confusing settings
SecurityGateway was created to address these issues. Many small-to-medium businesses trust SecurityGateway to protect their inbound and outbound email from spam, phishing attempts, and malware.
The following is a brief presentation that describes SecurityGateway’s features.
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.
MDaemon’s built-in spam filter includes a feature known as Bayesian Learning. Bayesian Learning allows MDaemon to “learn” what types of messages are spam and what types are not spam. This allows the spam filter to become more accurate over time.
It is important for users to properly train the Bayes system so that messages are correctly flagged as spam or non-spam. We do not recommend blacklisting the sender of spam messages because this does not help the Bayes engine learn from the message, and thus, has no effect on reducing spam. The easiest way to train the Bayes engine is for users to use the thumbs-up and thumbs-down icons in WorldClient (MDaemon’s webmail client) to feed the Bayes engine samples of spam and non-spam. The more spam and non-spam samples you feed to the Bayes engine, the more accurate the spam filter will become over time, thus, it is very important for users to use the thumbs-down icon on every spam message – whether it arrives in your Inbox or in your Junk Email folder. Likewise, for every false-positive (legitimate, non-spam message that is flagged as spam), you can use the thumbs-up icon to flag the message as non-spam.
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.
In addition to its built-in spam filter, MDaemon includes many other security features that can be used to fight spam. In this webinar, we take you through an in-depth explanation of MDaemon’s spam-fighting features, and discuss recommended settings for best results.
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.
WorldClient, MDaemon’s webmail client, features icons that users can click on to feed examples of spam or non-spam to MDaemon’s Bayesian learning feature.
MDaemon’s Bayesian Learning feature allows you to feed samples of spam and non-spam to designated folders. These samples are used to train the spam filter to recognize spam and non-spam messages. The more samples you feed these folders, the more accurate your spam filter can be over time. This feature is especially useful if you work in an industry that uses medical or financial terms. If you work for a bank, messages containing pharmaceutical terminology can be handled with greater scrutiny, while messages of a financial nature can be treated with less suspicion. The same is true if you work for a medical facility. Your daily email correspondence may contain messages with names of medications or other pharmacy related terms, while they may not contain many words of a financial nature. So if you’re a bank & you receive a great deal of spam with the names of medications in them, you can feed those messages to your Bayesian Learning folder so that MDaemon can learn from them based on your specific business.
Using WorldClient, MDaemon’s webmail client, users can feed examples of spam and non-spam to MDaemon’s Bayesian Learning system using the Thumbs Up & Thumbs Down icons in the upper toolbar. But what if these icons are missing for a particular user, or for all users? Or, what if you as the administrator do not want users to have access to the Bayesian learning folders due to messages being improperly fed to the wrong folders? In this situation, you could create two more folders for spam and non-spam messages, then grant your users access those folders instead of to the main Bayesian learning folders. This means, though, that the thumbs up & thumbs down icons will not appear in WorldClient, but users would still be able to access the new public folders you created (if you granted them access via Public Folder Manager) for placement of samples of spam or non-spam.
I’ve put together the following tutorial video, which shows how to enable the Thumbs up & Thumbs down icons in WorldClient.