These days, there are many anti-spam software that each utilizes a different tehcnique in order to stop unwanted emails come to their users’ inbox. Although none of them can perfectly stop spams, they are still a valuable tool.

Blacklisting is one of the oldest spam elimination methods. This works by identifying the IP address of the sender. If the IP address is identified comes from a spammer, the ISP will be notified. The weakness of implementing this method is spammers can change his IP address to continue their work.

Another anti-spam technique is called profiling. anti-spam software that implements it will look for stuff like bugs and invalid message ID’s in determining whether an incoming email is a junk. To spot new characteristics utilized by spammers, a prepared team of pros is involved.

There are also anti-spam software that work through the collaboration of the users. Briefly, it is the users who determine whether an incoming email is a spam. If a number of users have classified that a chunk of mail or an IP as spam, the email address or the IP will be fully blocked from reaching the members’ inboxes.

Modern anti-spam software today come with the capability to learn new techniques utilized by spammers. Bayesian filtering, the name of the technique, works by comparing an email received with the ones that have been rejected. Such software will then block or filter emails that contain particular items or characteristics.