Spam Filter ISP is a Program which is aimed at one-off users and small enterprises to quarantine emails that are designed to get you clicking where you shouldn't. Spam, Spam, Spam-ety, Spam If you find unsolicited emails to be a chore, then Spam Filter ISP may well be the cost-effective solution you are looking for. This is because a license to use the utility software is charged by the domain name used, not the number of subscribers. This makes it ideal for families and business which all share the same domain in their email addresses. In operation for over 15 years, the spam filter software scans images, even when they are in PDF format, looks out for email-borne viruses and checks for so-called phishing scams.
When an email is sent to you from a blacklisted IP address, Spam Filter ISP steps in to make sure you don't see it. Furthermore, you can set the plug-in Program to cut off all email sent from certain countries, if you like. Real email senders have their DNS MX mail records tested to ensure that you only see the genuine article in your inbox. Don't Like Spam? If you don't like spam, then the statistical methods used by Spam Filter ISP offer an effective method of reducing the amount you might be getting. This plug-in is ideal for users of Microsoft Outlook who are looking for added protection. Author's review.
SpamFilter is used by ISPs and companies running their SMTP servers. It is designed to be a proxy to your incoming SMTP server receiving all e-mails addressed to your domain. If the sender's IP is not blacklisted in DNS-MAPS based black lists then the e-mail is forwarded to your SMTP server. Statistical Bayesian DNA fingerprinting, along with dozens of blacklist/white rules are also be applied to filter spam. RegEx (Regular Expressions) can be applied to almost any filter.
An optional antivirus plugin is available. End users have Web access to their quarantined e-mails.
Contents. Why get a filter?
For many years the Brethren have warned us of the dangers that accompany the Internet, and have counseled us to employ some technological barriers to the unending flow of filth that permeates the otherwise wonderful and extremely useful virtual world of the Internet. Recall President Hinckley’s warning in 2002, when he said: “Guard your homes. How foolish it seems to install bars and bolts and electronic devices against thieves and molesters while more insidious intruders stealthily enter and despoil”, or more recently when Elder Oaks told us in April conference, 2005: “We must also act to protect those we love.
Parents install alarms to warn if their household is threatened by smoke or carbon monoxide. We should also install protections against spiritual threats, protections like filters on Internet connections.” Do filters work?
A common question that arises is whether Internet filters really work. The answer depends on what you are attempting to accomplish with the filter. If you are attempting to prevent accidental access to inappropriate content, then most filters can be considered successful. Many filters also have other features, such as time controls, chat logging, reporting and other useful capabilities. All of these features help keep our family safe, and help provide us with more information regarding how our computers are being used. From this perspective, it would be safe to say that filters work. One of the unfortunate side-effects of installing a filter is the false sense of security that it provides.
Most teenagers can get around just about any filter if they really want to, and parents need to know how this is done so they can watch for the warning signs. Also, be sure to use the tools that the filter provides, such as usage reports, blocked site reports, etc. A filter is not a silver bullet, and it is not a set-it-and-forget-it solution. Increasing individual accountability is one of the most effective ways of filtering content. It is a good practice to place the computer in a public place, and to limit the use of the Internet to times that others are around. Windows Vista/7 and Mac OS X offer time limits on internet access, as do most filters.
Many home routers now also offer availability schedules for protecting non-computer devices. The only fool-proof filter is, as President Faust once explained, the personal moral filter. 'As the traffic on the communications highway becomes a parking lot, we must depend more and more on our own personal moral filters to separate the good from the bad.' Filter types An analogy might be helpful as we discuss the different filter technologies. Let’s consider the content on the Internet to be analogous to mail that is delivered to your home. A filter could be thought of as a guard that is hired to sort through your mail before it is delivered to you. This guard could be asked to remove any junk mail, or even mail from any individual or company, and set it aside so you don’t have to deal with it.
The guard would then review each piece of mail before handing it to you. Filters work in similar fashion, sorting through the content that your computer requests, and preventing certain content from entering your home.
To understand the different filter technologies, let’s relate them to this guard, and where he might intercept our mail before giving it to us. There are three basic technologies used for filters today, namely: Software This is the most common filter, and it comes in the form of an application that is downloaded from the Internet or purchased in a store, then installed on your computer. The filter interjects itself into the communication chain between the applications on that computer and the Internet so it can watch the communication, and perform its guard duty. Software filters are usually the most robust, and offer the greatest level of protection – not only from pornography, but from other dangers as well (such as online predators, online gaming, etc). In our analogy, this option is like putting a guard at your front door. A software filter looks at data as it arrives on your machine. It is important to note that because the filter is actually installed on your computer, the bad content will exist on your computer, but the filter intercepts it before it displays on the screen.
Hardware When you have a broadband Internet connection, or an always-on connection, there is a physical device that you must use to connect your computer to the Internet. This may be a cable modem or a DSL router; it all depends on what type of broadband connection you have purchased.
Some of these routers, or modems, have built-in software that filters the Internet. This is an example of a hardware filter – the hardware device that brings the Internet into your home can be configured so that it will filter the content before it arrives on your computer. You do not need to install anything on your computer; the mere fact that your computer uses this device to access the Internet ensures that the content is filtered.
An example of a hardware filter is. This option is similar to the guard standing at your mailbox, intercepting the mail directly from the mailman before it is placed in your mailbox.
The bad content is intercepted before it ever arrives on your computer. DNS Another option is to use a such as to provide filtering. This provides a free option with many of the benefits of having a hardware solution, without having to purchase additional hardware because it will probably work with your existing home networking hardware. All that is required is to update the primary and secondary dns entries at the router to point to the opendns servers, and then open an account on open dns, which allows you to set your filtering options for your home network. Directions for doing so are on the open dns website.
This option has the advantage of filtering all of the devices in the home; including the computers, cell phones, TVs, game consoles, etc. Any device that would connect to your router, either by wire or wireless. Cell phones connected to the Internet via a cell tower will not be filtered. Internet proxy Some Internet Service Providers (ISPs) will offer filtering as part of their service. If they don’t, you could sign up with a service on the Internet, called a “proxy,” that will filter your content on the Internet before sending it to your home.
Since this works on the Internet, there is nothing to install on your computer. If this service is offered by your ISP, then there is usually nothing to configure – you simply turn this service on with your ISP, and it filters all content. If you are using a proxy service, then you must configure your individual computer to use the proxy filter. It doesn’t necessarily install anything on your computer, but you do need to ensure that the computer is configured to use that proxy. Like hardware filters, Internet proxy filters are usually simplistic, and would not have the robust features of a software filter.
Continuing our analogy of a guard watching our mail, this would be comparable to our guard standing at the post office and inspecting each piece of mail before it is loaded onto the mail truck for delivery. VPN (Virtual Private Network) A VPN solution is becoming more popular today as more and more devices travel outside the home. Tablets and smartphones are making it increasingly difficult to filter the devices children use to connect to the internet. A software filter on a computer does not protect these smart devices. A hardware filter (like on a router) can protect these devices if they are connected to the WiFi home network, but not when 3G/4G mobile network is turned on. A DNS or proxy filter is hard to configure on a smart device, easy to bypass, and often doesn't filter network traffic from apps.
There are apps which attempt to protect a smart device, but they often require using a custom internet browser and do not protect other apps. A VPN filter is really the best solution for smart devices today because it protects all internet traffic (even from apps installed on the smart device).
A VPN filter can also be used on a home router or directly on a compuer. Some examples of VPN-based filters include, and. How to select a filter Now that we understand the different types of filters, how can we determine which is the best type of filter for our home?
There are some simple questions that you can ask yourself that will help you determine which filter will best fit your families’ needs. What devices are you trying to protect? Many devices today are Internet-enabled, and would benefit from protection.
It is important to keep in mind that we are not just talking about desktop computers, but also any laptops, gaming consoles, set-top TVs or any other Internet-enabled device in your home that uses your network to access the Internet. Remember that cell phones do not fall into this category, since they use the cell phone network for their Internet access. Just about everything else that accesses the Internet in your home uses your home network to do so. If you have several different devices that connect to the Internet, it is probable that you have a broadband connection. You might want to investigate the hardware solution first, since some of these devices cannot install software.
For example, many game consoles can access the Internet via a wireless connection in the home, but you cannot install any software on these devices. If you are able to use a hardware filter, then the device will automatically be filtered simply by the fact that it connects to the Internet through your hardware device. What operating systems (OS) are run in your home? An operating system is the application that you interact with to operate the computer. It is what “boots up” the computer and what you log into for access to that computer (although not all operating systems require a login). The most common operating systems are the several versions of Windows from Microsoft Corp (Windows XP, Vista, and a few older versions), and a couple of versions for the Mac from Apple.
There are a few other popular OS’s, but they are usually only installed by people very familiar with technology, and thus outside of the audience group for this article. As a rule of thumb, if you have multiple operating systems in your home, you probably want to consider a hardware filter.
A hardware filter doesn’t require direct interaction with the OS and you don’t have to worry about whether it will operate in the same way on all of your computers. However, there are a couple of software filters on the market today that support both Windows and Mac operating systems.
If you only have two or three computers to filter and you have a heterogeneous operating system environment, you may want to do just a little bit of research before deciding that a software filter is not for you. Remember that software filters tend to be more robust, and protect from more dangers than hardware and Internet proxy filters.
In the latest shipping versions of operating systems for Windows and Mac, there are built-in filters that you can use for free as part of the system. They are not as robust as some of the commercial filters that you would purchase, but they are certainly better than no filter at all. Before you purchase a solution, check to see if you are running the latest version of the operating system, and whether the built-in filter will suit your needs. Do you have laptop computers in your home? If you have laptops in the home, it is highly likely that these laptops access the Internet when away from home as well.
People can access wireless networks in school, in libraries, on buses, and in many other “hotspots” around town. If you want to be sure that these laptops are protected when away from home as well as when accessing the Internet in your home, then you would want a software filter or an Internet proxy filter. The reason is that the hardware filter would only protect the laptops when they connect to the Internet through the hardware device in your home. Do you want to prevent inadvertent access, or are you trying to stop someone from their deliberate attempts to view inappropriate material? If you are trying to prevent inadvertent access, then any filter will do. If, however, you are trying to prevent someone from deliberately deactivating the filter to seek out inappropriate content, then you want to look at the more sophisticated commercial software filters. Generally speaking, hardware filters are harder to get around than software filters, but most of the commercial software filters on the market today are built so that you have to have quite a bit of technical expertise in order to subvert them.
The free filters tend to be easier to subvert as well. How do you connect to the Internet? If you use a dial-up connection to the Internet, then you typically would not have a gateway in your home, so a hardware solution would not be appropriate for your environment. Instead, you would look for a software filter or an Internet proxy filter. Are you concerned with accessing pornography only, or with other dangerous activity, such as Internet predators, chat rooms, etc?
Generally speaking, both hardware and Internet proxy filters are more rudimentary, and with a few exceptions will focus primarily on preventing access to pornography or other inappropriate content. They will not necessarily log chat sessions, provide usage reports based on each individual in the home, or any of the other more sophisticated filtering technologies that a commercial software filter would provide.
If you are interested in this level of detailed reports, or in the other social-networking, chat room, instant messaging features, you should consider a software filter. Do you need to restrict the times that the Internet is used? Some filters have time controls built into them, so that you can turn off access to the Internet during certain times. If you do not want anyone to access the Internet from midnight to 6 am, for example, most software filters would have the ability to enforce this, whereas most hardware filters would not. Those hardware filters that do allow this would normally be an all-or-nothing solution: in other words, with a software filter you could allow some people to access the Internet at certain times, and others would be more restricted. With a hardware filter, everyone has the same time restrictions. How do you want to handle over-blocking?
Given the current state of filter technology, you can rest assured that you will be blocked when you shouldn’t necessarily be. There will be times when you attempt to access a site that the filter thinks should be blocked, but you know the site to be OK. This is called over-blocking. With software filters, this is usually trivial to handle, as you can simply enter an administrator password and continue on to the site. With hardware and Internet proxy filters, many times you need to contact the administrator of the filter (like your ISP, for example) and ask them to unblock the site.
This usually takes time, and can be a source of frustration. Where to get more information Once you have the answers to these questions, you can then start your investigation of which filter is right for you. If you are interested in a hardware filter, it is probably best to go talk to someone in a computer store, or talk to your Internet Service Provider to see what they offer. It may be the case that the hardware device you already have has a filter capability, and you simply need to turn it on.
If you are interested in a software filter, then you need to decide whether you want to purchase a commercial filter, which would have more robust features, or whether you want to find a free solution that will simply protect access to inappropriate content. Commercial filters are available for around $40 - $60 per computer per year. If you are interested in a commercial filter, you can research on the Internet to find a suitable filter for you.
If you would like a more basic, free version of the software, first look at your operating system. As mentioned above, both of the latest versions of Windows and Mac operating systems have built-in software filters that may serve your needs. There are also free filters available for download that you can find online. Simply search for “free internet filter” to begin your research. For more information about filters you can use, see below in the 'Additional information' section. References., President Gordon B.
Hinckley, Ensign, January 2002., Elder Dallin H. Oaks, Ensign, May 2005., President James E. Faust, Ensign, May 2000 Additional information There are some good filters that are provided for free, which will provide some protection from pornography. A couple of examples are:. from CurrentWare. This software allow you to block websites using a blacklist.
It also lets you block websites based on categories. A cloud-based solution that protects all devices (computers, laptops, smartphones, tablets, smart TVs, gaming consoles, etc.) This filter uses blacklists as well as true content filtering (where it scans every webpage for objectionable content). The most unique feature of the NetAngel filter is the instant alerts.
A text message is sent to a parent or spouse whenever a site is blocked in realtime. This invites conversations to happen about appropriate internet usage. This service is free when protecting one device or computer. NetAngel also supports specific routers and also sells preconfigured routers to protect your entire WiFi network with a premium subscription. from BlueCoat. This is a great option for those who are not technical.
It is easy to install and configure, and works very well. from OpenDNS. This is a great option for those who are a bit more technical. It requires some technical ability to install and configure, but protects all WiFi (wireless network) devices in the house, including game consoles. Typically, it does not protect cell phones that are directly connected to the mobile network (3G/4G) rather than to the WiFi. from Norton.
This is a great option to keep track of children's internet access and is easy to use and install. It allows the child to send a message to the parent indicating why they wish to access the site. It also does well with social networking sites. It has an easy monitoring system to know what words are being used when searching on the web. But a simple search of everyday terms still can give inappropriate results, even with most of the filtering categories selected.
This can be easy to disable for a tech-savvy child. This provides setup details for the OpenDNS FamilyShield Router, which blocks domains categorized in the OpenDNS system such as Tasteless, Proxy/Anonymizer, Sexuality, Pornography, or Weapons. For a review of some of these free solutions, as well as paid solutions, please see.
Tip within a tip: Can you spot a fake email?. While there's no perfect solution for completely getting rid of spam, there are ways to cut down on it substantially. We're going to walk you through three of those options that cover tweaking your existing email to getting a new one. Train your spam filter While many people lament the amount of spam they get, a lot of them don't take advantage of their email's built-in spam filter. This is especially true if you're using your Internet service provider's email system, since those are often a bit more basic than larger Webmail services. Your first step is to look at your email's buttons.
It will likely have an option that lets you check messages in your inbox then 'Mark as Spam,' or 'Send to Junk folder.' If you've opened an email, you should see a button near the Delete or trash can icon that lets you mark the message as spam or junk. Here's an example from Outlook.com (also Live.com or Hotmail.com): Sure it's annoying to do this for dozens of emails, but it should start to learn very quickly what you don't want to see. You can see the spam in your inbox cut down from dozens to a handful of messages a day. If you're using a major Webmail service like Outlook.com, Gmail or Yahoo, the spam filters are good. With a smaller email service, however, it might not catch everything or be as smart as it could be.
For example, it might mark emails as spam it shouldn't, like the daily emails we send you. Contoh membuat proposal. Tip within a tip: Don't get our informative daily emails? If your email's spam system isn't cutting it, it might be time for an upgrade.
Get another spam filter You can't actually install a new spam filter in your email account. That's handled by your email provider. You can, however, take advantage of another email service's spam filter or a third-party spam filter. For example, Google lets you link up multiple email accounts so you can read your mail through Gmail. Not only does that keep you from jumping around email sites, you get to take advantage of Gmail's excellent spam filter.
To link up your address, create a free Gmail account, or log in to the one you have. Then click the gear icon in the upper-right corner and select 'Settings.' Go to the 'Accounts and Import' tab and next to 'Check mail from other accounts' click 'Add a POP3 mail account you own.' Fill in the information for your other email address and you will start seeing your email in Gmail. In most cases, Google should figure it out automatically, but you might need to contact your ISP or email provider for server information. While you're in the Settings area, the setting above 'Check mail' is 'Send mail as.' This lets you send email from Gmail and make it look like it's coming from your other account.
That's a good idea if you don't want people getting confused and replying to your Gmail address instead of your main address. Most other free Webmail services have a linking option as well. For Outlook.com, click the gear icon in the upper-right corner and select 'Options.' Then click 'Your email accounts' and choose 'Add a send-and-receive account.' Put in your information and the email will start appearing. Yahoo has a similar system, but only supports Yahoo, Google, Outlook and AOL accounts. It doesn't handle ISP email at this time.
If you another mail service, poke around in the settings or contact the provider for instructions. The only downside to linking email addresses is that deleting an email in Gmail, Outlook or Yahoo won't delete it from your original account. Every month or so you'll need to go into your original email account and delete all the messages to keep it from going over the storage limit. If you don't want to mess with multiple email services, you can try a third-party service like.
Link it up to your email and it scans your usage history to figure out what emails you want to see and which ones you don't. The ones it filters it puts in another folder so you don't have to wade through them. It works with any email account and doesn't read or store your messages for security. Start over If you're seriously drowning in spam, and even the steps above don't fix it, it's time for the nuclear option: start a new account. That gives you a fresh email address that spammers don't have on their lists. Of course, none of your friends and family will have it either. And you'll be missing years and years of emails and contacts.
However, there is a way to go about it that makes it relatively painless. You can use the steps above for Gmail, Outlook.com and Yahoo to link up your existing email address. This will bring in your old emails, and you'll keep getting emails people accidentally send to your old address, or from service you signed up for. Both Gmail and Outlook.com also let you import your old emails without link accounts, and Gmail will also bring in contacts. Gmail In Gmail, click the gear icon in the upper-right corner and select 'Settings.' Go to the 'Accounts and Import' tab and click 'Import mail and contacts.'
Enter your email information and Gmail will pull in your mail and contacts. Gmail will also keep pulling new email for the next 30 days. Outlook.com For Outlook.com, click the gear icon in the upper-right corner and select 'Options.' Click the 'Import email accounts' link. Choose your current email provider and enter your information. Note that Outlook.com only pulls email from IMAP-capable email accounts, which many smaller email services aren't.
Then you just have to let everyone on your contact list know that you have a new email address. You might even keep your old account around to give out to companies and people who aren't your friends and family. Speaking of which. Bonus: Keep spammers away from your new address You've got a shiny new address, but if you aren't careful it will become spam central again in a few weeks. That's why you need to set some rules for how you use it. If you start giving it out to every website or company, eventually you'll find one that sells your address to a spam list.
That's why you should only give your new address out to friends and family. For other uses you have a few options. You can use a service like to create fake, temporary email accounts to use for registering on sites.
Webmail is free, so you can create a second email address that you use for signing up or giving out to companies. Simply link it up to your main address so you can see your email in one place. However, if it gets too spammy, you can always disconnect or delete it. The major Webmail services also make it easy to create aliases. Gmail With Gmail, just you can add a '+word' to any email address when you give it out. So, if your address is '[email protected],' you can give out the address '[email protected].'
Email going to that address will show up in your main inbox but will have that extra bit tacked on when you look at the email information. That means you can use Google's filtering tools in SettingsFilters and Blocked Addresses to direct emails going in to alias addresses to certain folders or just have them go straight to the trash when you no longer want them.
You can create as many of these aliases as you want. Note: Some websites don't accept Google's alias email addresses.
Outlook.com For Outlook.com, go to Settings and click 'Create an Outlook.com alias.' You can create several to give out, and manage them in Settings using the 'Aliases: manage or choose a primary.' If one alias gets too much spam, you can just delete it. Yahoo Yahoo lets you create disposable email addresses with a 'base name' and 'keyword.'
You can create up to 500 keywords, which is a lot of disposable email. Click the gear icon in the upper-right corner and select 'Settings.'
Go the 'Security' tab and under 'Disposable Addresses' click 'Create base name.' You can make the base name the first part of your email address or something random, such as 'spatula.'
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Something random would be better because it keeps someone from figuring out your main email address. Just note that you can only have one base name per Yahoo account. Once your base name is created, you can start making keywords, such as 'contests,' 'bills,' 'junk,' or whatever else you want. When you're giving out an address online or to a company, you can just tell them, '[email protected].'
Did these tips help out your spam situation? Do you have your own tricks you use for avoiding spam?
Let us know in the comments.
The following are included with base package of protection: Web Filter: Computer Team’s Untangle Network Defender web filter (internet filter) enables administrators to enforce network usage policies and monitor user behavior. Powerful features such as Zero client installation and category block lists make it easier for administrators to:. Protect the network from malware on the web.
Block time-wasting sites like MySpace, FACEBOOK, YOUTUBE, and porn. Conserve bandwidth by blocking audio/video downloads. Leverage community URL categorization with the Virus Blocker: Stop virus outbreaks before they reach users desktops. With an intuitive GUI and the ability to scan multiple protocols, Untangle makes it easier for administrators to:.
Protect users from virus threats over web (http), email (SMTP, POP & IMAP) and file transfer (FTP) protocols. Scan archives and compressed files like Zip, RAR, Tar and many others. Ensure that signatures are always current with automatic updates Spam Blocker: Computer Team’s Untangle Network Defender Spam Blocker uses to block spam at the gateway before it ever reaches the users. Zero client installations and an intuitive GUI make it easy for administrators to:. Leverage the best spam filtering techniques including Bayesian Filters, Razor, real time block lists (RBLs), OCR for image spam and tarpitting.
Provide individual quarantines for each mailbox. Filter SMTP, POP & IMAP Ad Blocker: Eliminate Annoying Ads and Improve Page Download Times Ad Blocker enables administrators to block web ads at the gateway by transparently removing them from web pages. Benefits include:. Easier to read web pages without distracting ads. Improved page download times. Reduced traffic on the network Phish Blocker: Block Phishing & Pharming at the Gateway Identity thieves are becoming increasingly sophisticated with email and website spoofs that are nearly impossible to discern from the real thing. Phish Blocker makes it easier for administrators to:.
Protect users from email phishing attacks and fraudulent pharming websites. Protect multiple protocols, including HTTP, SMTP, POP & IMAP. Ensure that signatures are always current with automatic updates Spyware Blocker: Block Spyware at the Network Gateway Spyware Blocker enables administrators to block spyware at the network gateway before it reaches users desktops. Zero client installations and an intuitive GUI make it easy for administrators to:.
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Product Offered Description Pricing Computer Team Untangle Network Defender Dedicated Server This is a machine that has built to the specifications of Untangle to perform at its maximum speed. (1 Year Depot Warranty). Price includes a fully setup unit ready to run. It does not include on site installation. It is recommended that you have an IT Professional do the installation. $695.00 Each $43.00 / mo.
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For 24 mos. $31.00 / mo. For 36 mos. $25.00 / mo. For 48 mos. Basic Service for updates on system This will included the latest updates for all of the services listed above in the standard system. $108.00 Each Year or.
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$12.00 / mo. For 36 mos. $10.00 / mo. For 48 mos. Live Support Included with Professional Bundle or Included with Super Bundle (See Below) Live expert technical support is available as a commercial subscription to Untangle for organizations with mission-critical IT networks. Customers can contact Untangle's U.S.
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The SFDE filter has been developed exclusively by LogSat Software. Similarly to the and the filters, this filter uses a very powerful resource to stop spam: The entire global SpamFilter ISP user community. This latest filter is proving to be one of the most effective and accurate tools in stopping spam. Anytime a company running SpamFilter ISP blocks a spam email, SpamFilter will parse its contents and scan it for any email addresses it contains in the body.
These will usually be email addresses associated with the spammer or the website the spam emails directs users to. SpamFilter will then create a unique hash for each email address in that email and will upload that hash to our centralized SFDE database.
This allows the SFDE filter to have access to a huge repository of real spammer's email addresses, updated in real-time by all the SpamFilter ISP installations in the world. Our database analyzes this data in realtime, and will block emails that contain the same hashed email addresses being reported as spam at that time. This allows the SFDE to be extremely accurate, effective, and to start blacklisting spammer's email addresses within minutes of them sending spam. Email addresses from the database are automatically aged and removed from the database within 6-24 hours if they stop sending spam and/or viruses. The SFDB filter has been developed exclusively by LogSat Software. This filter uses a very powerful resource to stop spam: The entire global SpamFilter ISP user community. This filter, along with the filter, is proving to be one of the most effective and accurate tools in stopping spam.
Anytime a company running SpamFilter ISP blocks an email, the sender's IP address is sent to our centralized SFDB database. This allows the SFDB filter to have access to a huge repository of spammer's IPs, updated in real-time by all the SpamFilter ISP installations in the world.
Our database analyzes this data in realtime, and will block IPs that have sent excessive amounts of spam to multiple locations in the world in the spam of the previous few minutes. This allows the SFDB to be extremely accurate, effective, and to start blacklisting IPs within minutes of them sending spam. IP addresses from the database are automatically aged and removed from the database within 6-24 hours if they stop sending spam and/or viruses. The SFDC (SpamFilter Distributed Content) filter is a propietary filtering technology developed by LogSat Software. When SpamFilter ISP receives an email, it will analyze the email's contents and will calculate a 20-byte hash to characterize it. We developed technology that is able to detect similar emails based on their contents.
SpamFilter will assign the same hash to similar emails. When SpamFilter detects that emails with the same hash signature are originating from several different locations, it will report such anomaly to our centralized servers. Our database analyzes, in real-time, this incoming flow of messages, and, based on their quantity, origin and destinations, is able to detect what signature hashes are generated by spam emails. The technology behind the SFDC allows our centralized database to detect spam signatures regardless of the email's text and contents, but rather base it on the patterns used by spammers to deliver their emails. Greylisting is not an anti-spam filter itself.
More specifically, greylisting takes advantage of a required behavior by the RFCs that some anti-spam products use to greatly reduce the amount of spam received. In the majority of the cases, when a 'spam bot' computer is used to send spam, it will do so by sending huge amounts of emails in the fastest way possible. If a recipient's SMTP server does not respond, chances are that the spam bot will ignore such server and move on. Luckily this behavior by spammers is in direct violation of the RFCs that dictate how email works. The RFCs require that, if an initial attempt to deliver an email fails, the sender must retry to send it.
Greylisting takes advantage of this by initially denying every connection attempt from an IP address. Only after a certain, small amount of time is the remote IP allowed to connect. If the sender is a spam bot, it is very likely that said IP will never retry to connect again, and so it will not even try to send spam. If the sender is a legitimate server, they will be following the RFC guidelines, and within a few minutes they will retry sending the email, which will be then delivered. In addition to the filter specified in other sections of the website, SpamFilter ISP supports several more filters that can be used to detect spam. A partial list is below. Local IP Blacklist - Our SPAM Filter server checks if the remote server's IP address matches an entry in your local IP blacklist file, the email is rejected.
Local Domain Blacklist - The SPAM Filter gateway checks if the domain portion in the sender's email address is in your local domain blacklist file, the email is also rejected. Local FROM EMail Blacklist - The sender's email address is checked against your local list of blacklisted email addresses. If present, it is rejected. Local TO EMail Blacklist - The recipient's email address is checked against your local list of blacklisted email addresses. If present, it is rejected. Attachment Blocking - SPAM Filter can check emails for specific attachments or attachment extensions.
If found, the email is rejected. Keyword Content Filtering - Our SPAM Filtering software can check email content and subject for specific keyword and/or phrases. If found, the email is rejected. Honeypot Emails - You can have a list of 'honeypot' email addresses. Any email sent to an address in the list will cause the sender's IP to be blacklisted.
Connections can be rejected if the remote server does not have a reverse DNS PTR entry. Spam Filter is able to check if the sender's MX DNS record is valid before accepting email. Refuse connections if there are too many spaces in the subject line.
Max Recipients in single session - Use this setting to limit how many RCPT TO commands can be issued in a single session. Max Email Size - Incoming emails can be blocked if they exceed a certain size. Reject if Empty 'Mail From' - If this option is checked SPAMFilter will reject all emails with an empty 'Mail From' field. Reject if 'Mail From' = 'Mail To' - Reject all emails where the sender's email is the same as the recipient's email.
Reject if 'From Domain' = 'To Domain' - SPAM Filter can reject all email where the sender's domain is the same as the recipient's domain. Tag Spam & Deliver - Allows to tag spam by adding the header 'X-SF-SPAM:Y' to email classified as spam.
The email is then forwarded to the destination SMTP server. This allows administrators to handle spam as they wish on the back-end.
Tag Spam in Subject & Deliver - Allows to tag spam by prefixing the word SPAM: in the subject line of emails classified as spam. The email is then forwarded to the destination SMTP server. This allows administrators to handle spam as they wish on the back-end.