An Introduction To Spam Filters
Using spam filters is another very effective way of combating spam or junk mail. These programs use some keywords like guaranteed', free', etc and block any email with those words in them. But this has the disadvantage of sometimes blocking even important mails from your contacts and preventing those senders from ... already identified spam mails. The error margin for these filters is almost zero as more than 99% of scams are identified and eliminated through this method.