Most of the email messages sent around the globe nowadays are spam, i.e. unsolicited messages with different offers or with hyperlinks to malware. Not only are such emails aggravating, but they also present a threat to your personal computer, not to mention that you may be scammed. That’s why, numerous mail service providers use spam filters, which are software apps that monitor all incoming messages and filter out the unwanted ones on the basis of their content – what words an email message includes and how often they are mentioned, what website a certain hyperlink opens, what SMTP mail server the message is sent from, etc. Certain web hosting providers also make use of the databases of spam-tracking organizations devoted to providing the most up-to-the-minute information about unsolicited email messages, to ensure that their clients will not receive any email message in their mailbox that is not supposed to be there.