When it comes to rented or purchased lists, you may come across vendors or marketers who say, "This email list is totally opt-in!" This means the people on the list opted in to an email communication from someone at some point in time -- the list provider, for example -- by filling out a form or checking a box to receive more content from that provider.

Simpson says that he can tell when a brand hasn’t put effort into designing a mail piece, but he can also tell when it puts in too much misguided effort. Direct mail shouldn’t look like a beautiful magazine ad, he says, as this kind of mailed content tends to draw little response from consumers. Instead, direct mail pieces should have good copy and the right offer for the right demographic. 
CPA (Cost Per Action or Cost Per Acquisition) or PPP (Pay Per Performance) advertising means the advertiser pays for the number of users who perform a desired activity, such as completing a purchase or filling out a registration form. Performance-based compensation can also incorporate revenue sharing, where publishers earn a percentage of the advertiser's profits made as a result of the ad. Performance-based compensation shifts the risk of failed advertising onto publishers.[62]:4, 16

The huge advantage of email over social media is that prospects and customers are more likely to see an email than social media. Just posting something doesn't mean that everyone you want to see your message will see it. Your post might not even show up in your targets' social media streams. However, an email will sit in the inbox until it's read (or deleted). 
The books I've written have actually had three different titles, updated to move with the times. My first text book was titled: Internet Marketing: Strategy, Implementation and Practice. I then created E-business E-commerce Management and, with PR Smith, E-marketing Excellence, for professionals a couple of years later. Then, much later, the names switched and in 2012 we renamed the Internet Marketing book to Digital Marketing with the others becoming Digital Business and Digital Marketing Excellence.  About time too, since I was involved in developing the syllabus as an examiner for the first IDM Diploma in Digital Marketing back in 2004-5 when the term was hardly used at all - so it's been great to see 'Digital Marketing' adopted as the 'de facto' term, when I was first involved in defining it with the IDM students in 2004!

Email marketing is all about expectations, and it’s up to you to set them. If your call to action is strong, and your follow-up is consistent, then you can count on a positive campaign. However, if you promise to send one email per week and instead send them daily, then you’re setting yourself up for failure. On the contrary, if someone is expecting daily updates or critical product updates and you don’t’ deliver, then they are likely to be just as upset in that case too.
Enhancing the Value of Mail: The Human Response, sponsored by the U.S. Post Office, used eye-movement tracking and biometric measurements such as heart rate and respiration to gauge attention and emotional engagement with both digital and direct mail. It then used magnetic resonance imaging to capture participants' brain activity when asked to recall a particular ad. http://1287170585.rsc.cdn77.org/wp-content/uploads/2016/11/3Stages_EmailMkt_Branding.png
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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