Editing Anti-spam techniques (section)

===Background checks on new users and customers===

Since spammer's accounts are frequently disabled due to violations of abuse policies, they are constantly trying to create new accounts.  Due to the damage done to an ISP's reputation when it is the source of spam, many ISPs and web email providers use [[CAPTCHA]]s on new accounts to verify that it is a real human registering the account, and not an automated spamming system.  They can also verify that credit cards are not stolen before accepting new customers, check [[the Spamhaus Project]] ROKSO list, and do other background checks.