The CAN-SPAM Act of 2003 was passed by Congress as a direct response to the growing number of complaints over spam e-mails.[citation needed] Congress determined that the US government was showing an increased interest in the regulation of commercial electronic mail nationally, that those who send commercial e-mails should not mislead recipients over the source or content of them, and that all recipients of such emails have a right to decline them. The act authorizes a US $16,000 penalty per violation for spamming each individual recipient.[17] However, it does not ban spam emailing outright, but imposes laws on using deceptive marketing methods through headings which are "materially false or misleading". In addition there are conditions which email marketers must meet in terms of their format, their content and labeling. As a result, many commercial email marketers within the United States utilize a service or special software to ensure compliance with the act. A variety of older systems exist that do not ensure compliance with the act. To comply with the act's regulation of commercial email, services also typically require users to authenticate their return address and include a valid physical address, provide a one-click unsubscribe feature, and prohibit importing lists of purchased addresses that may not have given valid permission.[citation needed] 

It's practically impossible to overstate the importance of direct mailing lists to the success of your direct mail program. The correct mailing list will contain your most valuable prospects. The more careful you are in analyzing and selecting direct mailing lists, the better your chances for success. There are several different categories of mailing lists available on the market today ranging in cost and appropriateness for your market. When you are considering what type of mailing list to buy consider the following three types:
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