Most of the emails sent around the globe nowadays are spam, i.e. unwanted messages with different offers or with links to malicious software. Not only are such email messages irritating, but they also present a risk to your own computer, not to mention that you may be conned. That is the reason why many mail service providers resort to email filters, which are software applications that keep track of all inbound emails and filter the unwanted ones on the basis of their content – what words or phrases an email includes and how often they’re mentioned, what web site a particular link points to, what outgoing SMTP email server the message is sent from, and so on. Some web hosting providers also use the databases of spam-tracking organizations devoted to the provision of the most up-to-the-minute information about undesired emails, to make certain that their clients won’t receive any message in their mailbox that shouldn’t be there.