Electronic mail (e-mail) has been considered as one of the most convenient way to communicate among the users in the Internet. The rapid growth of users in the Internet and the abuse of e-mail by unsolicited users cause an exponential increase of e-mails in user mailboxes. Although there are several systems which use different AI techniques to filter out spam, there is hardly any system develop...

This diploma thesis had the main goal to develop and implement a collaborative spam filter tool. A group of users should be connected to an anti-spam network allowing them to block spam messages cooperatively. The implemented filter uses a server which accepts spam reports of all connected clients to collect information about newly spread spam mails. For every reported message the server genera...

Today’s attacks against Bayesian spam filters attempt to keep the content of spam mails visible to humans, but obscured to filters. A common technique is to fool filters by appending additional words to a spam mail. Because these words appear very rarely in spam mails, filters are inclined to classify the mail as legitimate. The idea we present in this paper leverages the fact that natural lang...

The most costly and annoying characteristic of the e-mail communication system is the large number of unsolicited commercial e-mails, known as spams, that are continuously received. Via the investigation of the statistical properties of the spam delivering intertimes, we show that spams delivered to a given recipient are time correlated: if the intertime between two consecutive spams is small (...

Spam is characterized as unnecessary and garbage E-mails. Due to the increasing of unsolicited E-mails, it becoming more crucial for mail users utilize a trustworthy spam E-mail filter. The shortcomings classifier are defined by their inability manage large amounts relevant messages effectively detect messages. Numerous characteristics in classifications problematic. Given that selecting featur...

One of the first applications of the Internet was the electronic mailing (e-mail). Along with the evolution of the Internet, e-mail has evolved into a powerful and popular technology. Messages, electronically documents, pictures and even movies can be send between users of computer systems at different places all over the world within seconds. Electronic mail is a fast, a cheap and a comfortabl...

Spam has become a major issue in computer security because it is a channel for threats such as computer viruses, worms and phishing. More than 85% of received e-mails are spam. Historical approaches to combating these messages, including simple techniques like sender blacklisting or the use of e-mail signatures, are no longer completely reliable. Many current solutions feature machine-learning ...

We present Active Spam Killer (ASK), a program that attempts to validate unknown senders before allowing delivery of their message. Validation occurs by means of a challenge reply sent to senders who are not yet known to the system. Messages are kept in a queue pending confirmation until the sender replies to the challenge. Further messages coming from confirmed senders are delivered immediatel...

In the last few years, as Internet usage becomes the main artery of the life's daily activities, the problem of spam becomes very serious for internet community. Spam pages form a real threat for all types of users. This threat proved to evolve continuously without any clue to abate. Different forms of spam witnessed a dramatic increase in both size and negative impact. A large amount of E-mail...

We propose anti-spam filtering methods for agglutinative languages in general and for Turkish in particular. The methods are dynamic and are based on Artificial Neural Networks (ANN) and Bayesian Networks. The developed algorithms are user-specific and adapt themselves with the characteristics of the incoming e-mails. The algorithms have two main components. The first one deals with the morphol...