Most emails sent around the globe nowadays are spam, in other words – undesirable messages with different offers or with links to malware. Not only are such email messages aggravating, but they also present a risk to your personal computer, not to mention that you may be duped. For this reason, a lot of email service providers resort to email filters, which are apps that keep track of all inbound messages and filter the unwanted ones on the basis of their content – what words or phrases an email consists of and how often they are mentioned, what site a given link points to, what outbound mail server the message comes from, and so on. Some web hosts also make use of the databases of spam-tracing organizations devoted to providing the most up-to-the-minute info about unsolicited email messages, to ensure that their customers will not receive any email message in their mailbox that is not supposed to be there.