Most emails sent around the world these days are spam, in other words – unwanted messages with different offers or with links to malicious software. Not only are such emails irritating, but they also pose a threat to your PC, not to mention that you may get tricked. That’s why, lots of email providers resort to email filters, which are software applications that ‘scan’ all inbound emails and filter the undesirable ones on the basis of their content – what words an email message contains and how many times they’re referred to, what website a given hyperlink redirects to, what server the email message comes from, etc. Certain web hosting providers also make use of the databases of spam-detecting organizations dedicated to providing the most up-to-date information about undesired messages, to make sure that their clients won’t receive any email in their mailbox that is not supposed to be there.