A spam filter is a piece of software that scans through a message to determine if it is spam or not. Most spam filters work in a very similar way, using a set of rules to try and work out what the message is about and whom it is from. Some are more successful than others.

Types of SPAM Filters :

1. Rules-Based / Bayesian Analysis
2. Content Based
3. White List and Black List
4. Challenge/Response
5. Community-Based

1. Rules-Based / Bayesian Analysis

Rules based systems are the original spam filters. They started life by simply looking for key words or phrases in the message and block based when matches were found. Simple rules based spam blockers are very poor at filtering out spam. They will often block a legitimate message and also let through a good percentage of the actual spam.

A Rules-based spam filter allows the user to determine which email is junk mail and sorts accordingly.

Bayesian Analysis is a relatively new method of filtering spam e-mail. It uses mathematical formulae to analyse the content of a message, learning from the user which is a valid message and which is spam.
A Bayesian spam filter relies on two things to work effectively:

1. How well the Bayesian analysis formulae has been implemented
2. How good a sample of data it has to work with

2. Content Based


Content-based filters block certain words or phrases of incoming mail.

3. White List and Black List


These are very basic types of filters which nowadays are rarely used on their own, but are still used as part of an integrated filtering system comprising some of the other methods shown here.

Whitelist filters will not accept e-mail from any address unless it is on a list of known "good" e-mail addresses.

Blacklist filters, conversely, will allow messages from any address unless the address is on a list of known "bad" sources.

White Lists and Black Lists filter your email either by names in your address book as approved senders, or by blocking known spammers based on a blacklist.


4. Challenge/Response

Challenge/Response filters are characterised by their ability to automatically send a response to an unknown sender asking them to take some further action to ensure their message will be received. This is often referred to as a "Turing Test" - named after a test devised by British mathematician Alan Turing to determine if machines could think.

Challenge/Response filters monitor mail by requiring unknown senders to respond with a security code before allowing their email.

Recent years have seen the appearance of some internet services which automatically perform this Challenge/Response function for the user and require the sender of an e-mail to visit their web site to facilitate the receipt of their message.




5. Community-Based

These types of filters work on the principal of "communal knowledge" of spam. These types of filters communicate with a central server. When a user receives a message that is spam, they simply mark it as such. This information is posted to the central server where a "fingerprint" of the message is added to the database. When enough people have "voted" the message as spam, it will be blocked from user's inboxes in the future.

Community Based anti-spam filters are based on a community of users that report known spammers. Some of the popular email programs use this type of filter. According to Consumersearch.com, this may be a sufficient enough spam filter.


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Nowadays, E-mail has revolutionized the way we communicate. In just a short amount of time, it has become a resource that most of us feel we would be hard-pressed to live without.

But for all its promise and convenience, e-mail comes with a downside - spam.

Unsolicited e-mails carry with them the risk of viruses, scams and potentially hurtful messages.

So how do you go about ridding yourself of these unwanted e-mails and get back to the business of quick, convenient and efficient communication? The most important step may be finding out as much information possible about the person or agency responsible for sending the offending e-mails.

Email Black lists contain known mail servers and addresses used by spammers. With these lists in place, access to the server can be denied and unwanted email messages are discarded. However, your legitimate emails may also be blocked.

In the early days, people were used to submit their email address to email directories. Sites like Bigfoot & Switchboard were very popular.

These days there is no worthwhile, purposeful email directory. Those of the late 90's (ie Bigfoot) still maintain large databases, but the data is very out-of-date.

Certain Web sites offer services that allow you to conduct reverse e-mail searches. You simply type in the e-mail address in question and you can receive information about the sender such as their first and last name, their street address and sometimes even the person's place of work.

Through a reverse email address lookup, you can generally find:

* Owner Name & Address
* Email Address IP
* Owner Photo
* Email Address Validation
* And More!

Having this information empowers you to confront the offending spammer by notifying them that you are aware of who they are, where they are from and perhaps who they work for. This simple revelation may scare the offending party into removing you from their e-mail list in order to avoid being turned into the authorities.

Under federal law, sending spam is illegal. By conducting a reverse e-mail search, you will be providing officials with the necessary information to pursue and eliminate the offending spammers.

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Nowadays Email marketing has become extremely popular. It is a great tool for marketing your products and services in front of a targeted audience. It also serves as a continuous form of dialog between your customer and you by which they are tempted to get back to the website that you want them to.

However, the SMTP Mail Server software may offer some serious challenge while sending emails to your customers. For instance, you discover that your mails are taking too long to be delivered, or in the worst scenario they are not getting delivered at all. If this is the case, you have to understand the mechanism behind this inconvenience. The SMTP Mail Server or the mail transferring agent (MTA) is the main sending engine for your bulk emails. This server decides the domains and the successful delivery for your outgoing mails. Without the help of this server your email will never reach its destination. When this server stops functioning properly, you receive un-delivered messages back to your inbox. Usually, this inconvenience occurs at the time of sending bulk emails.

The root cause for this problem started with the increase in volume of sending emails for various marketing purposes. The problem first manifested in email communications meant for personal usage; they were not designed for handling bulk emails. Also, the inability of the SMTP Mail Server in adapting to the challenges of bulk delivery, made matters worse. These problems and challenges occurred in the form of email bounces, non-delivery of mails to definite domains, and inadequate support for proper email authentication.

There can be many reasons for delivery related problems of your messages. The simple reason behind this problem is the lack of ability on the part of the SMTP Mail Server to take up the load for bulk messages. However, there are also some other complex technical issues behind this problem that needs to be sorted out for maintaining smooth transactions of mails.

The blacklisting of your IP address happens when ISP detects your ID as a spammer. The ISP gives its verdict based on the sending patterns of your mails for a considerable period of time. Blacklist-IP.Com is one of the Best Blacklist IP Monitoring Service Provider and offers a solution those who are related to Internet Networks and having Blacklisted IP address and Blacklist Domain.

As the messaging and communication landscape continues to evolve over the years, new communication channels appear and with them, new threats. What used to be a simple mail server configuration handled by local administrators has become a new industry requiring specific skills and expertise. Spammers are using sophisticated techniques to lure end users. Information theft has turned into a trillion dollar industry and is an issue that still isn’t addressed properly by a majority of organizations focused on protecting their customers’ data before securing their own.

Modern email security solutions help address a lot of these issues but Email and IT administrators are sometimes left in the dark by vendors focused solely on profit and cutting costs in an over-commoditized market. Here our aim is to presenting a few tips and features to use and apply in order to improve the security of businesses’ email communication systems. DNSBLs that list domain names are known as URIBLs, in which the content of the email message is checked for any URL’s registered with a URL database. If the URL of an email message from where the email message has come from including any URL’s within the subject or body are found and the URL exists within a URIBL database, then the email message is classified as spam, or suspected spam. URL databases such as SURBL are a list of website domains that have appeared in spam email messages.

Careful about backup mail servers

Many organisations need to have a backup mail server so that email activities continue to operate properly in the event of a server failure. In order to cut costs, some IT administrators will build a mail infrastructure using a single email security gateway sitting in front of the mail server.

Aware of your users’ white-lists
One of the oldest and most common methods for spammers to get through spam filters is by using the white-listed address spoofing. After entering envelope data properly, the spammer can fake a sender identity using the body of the message.

By using the recipient’s email address as the From address, they are able to get through filters when end-users white-list their own email address. Modern email security solutions will prevent users from white-listing their own email addresses automatically and system-wide but email administrators using older systems should pay attention and inform their end users about this possible backdoor.

Block all EXEs by default
All .exe files should be blocked. And the reason is simple. First, the majority of phishing attempts with drive-by-downloads try to entice end users to download and run .exe files. Second, all malware/viruses/worms are executables and the most common type of executables are .exe files (in a Windows-based environment).

Couple these two facts with Windows’ default permit behavior in terms of security and privileges and these threats get access to the entire computer’s abilities to act as a key logger, a bot, or a disruptive or destructive agent. To add complexity, Windows does not let administrators to easily control and limit execution of programs. Group policies can be used but a lot of software programs expect full control over resources in order to be able to function properly.

In some relatively rare cases, end users need to exchange legit .exe files. When this situation cannot be avoided, IT administrators should add very strict rules to their email security solution, in a highly controlled manner, to authorize specific executables. In the end, it will be a lot faster and easier to manage a list of several dozens authorized executables within a global white-list in the email gateway than complex policies comprising millions of blacklisted malware on a system not optimized or natively designed to handle such permissions.


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If you are using a common IP address on web hosting and this IP is being abused by spammer or computer viral activities, etc. most likely the IP address you are using will be blocked. Your site has contents that are not in favor to the other party and the party will blacklist your IP by blocking it to make it inaccessible.

To overcome the problems of your IP Address being blocked, here is the list of things you can do.

Use a free proxy server. Google "free proxy list" and try your luck. Use free proxy server for low demand browsing because they are over spam by advertisement banners and slow down your browser performance.
Install another computer in another location or country, and then use remote control software to get access to your computer and access the desired site. If you have extra cash, you can install your own VPN server in another location.

Most importantly, do not offer specific contents and keywords on your websites that speak ill or is against the country you have the most viewers from. Doing so will risk your IP being blocked.
Contact your web host and ask if they can re-assign you to another set of IP. If you have budget, you can get your own IP address for your website. Having a dedicated IP address also improve your ranking with search engines.
Use a paid VPN to get access. Most free VPN services use PPTP for communication. A paid VPN service offers you IPSec or SSL increase your chances of reaching the desired site is higher than PPTP.
Use a IP spoof tool to change your IP address. You can google and read more about it?

Call your friends in another location and login and get access on your behalf.


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Blacklisted IP, blocks specific IP addresses (and IP ranges), message senders or message recipients (local mailboxes). These blacklists (blocklists, blackhole lists, or DNSBL) are most commonly used by email receivers to screen out spam and other abusive emails flooding the Internet.

The best IP Blacklist use "honeypots" to detect new sources of abuse, and publish the source address within hours. Honeypots have addresses that are never used in a
legitimate email, but are posted on various websites and other locations where criminals typically "harvest" addresses. IP blacklists are most useful in efficiently blocking high-volume and persistent sources.

Every RBL Server has there own reasons and poicies to keep 1 ip in there databases. BUT herte we brings you some most common reason to get listed:

• Run dictionary attacks


• Mass mailings


• Spammers from IP's with no Reverse DNS


• Spammers from infected PC's (Dynamic or Generic Reverse DNS)


• Email Marketing Companies


• Compromised Servers


• And Many more...

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IP Blacklist is a database or list of IP addresses that should be blocked from connecting to a protected system.

These blacklists (blocklists, blackhole lists, or DNSBL) are most commonly used by email receivers to screen out spam and other abusive emails flooding the Internet. Blacklist-IP.Com allows you to manually check for listings on the most popular and widely used DNSBLs.

How do I find My IP is Blacklisted ?

There are a many spam cops on the internet who maintain anti-spam database. Mail servers, ISPs and bandwidth providers get blacklists from these databases and use them in their spam filters. Domains and IP addresses that are known to send spam emails are blacklisted immediately and added to the database. When a mail server finds that a mail comes from one of these blacklist sites, then the email will not be delivered to the recipient.

Just because your IP is blacklisted by a mail server, it doesn't mean that you can never reach that subscriber. Blacklisting simply means that your email won't be delivered directly. You can contact the mail server and request to whitelist your IP address. If the provider is able to trust that you are not a spammer, then your Blacklisted IP address will be removed from the anti-spam database and the changes will reflect globally in one or two days.

Many times, the IP address of your hosting provider may be in the blacklist and as a result, your emails may not be delivered. You may be wondering why my IP is blacklisted even though I pay the required amount. Your IP getting blacklisted is not your fault because spammers use IP addresses of other legitimate persons to conceal their own identity. Without even your knowledge, you may become a victim of such a spammer and your IP may get blacklisted.

If you want an answer to the question is my IP blacklisted, you have to do blacklist test. Some servers may allow your IP address while some others may blacklist it. You can know about those servers only when you compare your IP address against known blacklists. Since it is not possible for you to go and check every blacklist available, you should use a Blacklist Monitor Tool to Check Blacklist IP Address and Blacklist Domain.

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