Online advertisers can collect data on their ads' effectiveness, such as the size of the potential audience or actual audience response,[19]:119 how a visitor reached their advertisement, whether the advertisement resulted in a sale, and whether an ad actually loaded within a visitor's view.[59][60]:59 This helps online advertisers improve their ad campaigns over time.


E-mail promotion is widely used by e-marketers to send new product/service information to their registered customers. For example, airline companies periodically e-mail their registered customers about their e-fares and promotional vacation packages. Spamming refers to sending millions of e-mail promotions to recipients who have never asked for the information. These recipients' e-mail addresses are often purchased or swapped with other businesses. Spamming is at best unethical and at worst illegal.
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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