Most emails sent around the world these days are spam, in other words – unasked-for messages with various offers or with links to malware. Not only are such email messages annoying, but they also present a risk to your personal computer, not to mention that you may get tricked. For this reason, a lot of mail service providers make use of spam filters, which are applications that keep track of all incoming messages and filter out the unwanted ones on the basis of their content – what words an email includes and how often they are mentioned, what web site a specific hyperlink leads to, what outbound SMTP email server the email is sent from, etc. Certain web hosting providers also use the databases of spam-tracing organizations dedicated to providing the most up-to-the-minute information about undesired email messages, to make sure that their clients will not receive any email in their mailbox that is not supposed to be there.
