Cost per mille, often abbreviated to CPM, means that advertisers pay for every thousand displays of their message to potential customers (mille is the Latin word for thousand). In the online context, ad displays are usually called "impressions." Definitions of an "impression" vary among publishers,[58] and some impressions may not be charged because they don't represent a new exposure to an actual customer. Advertisers can use technologies such as web bugs to verify if an impression is actually delivered.[59][60]:59
One of Raquel’s suggestions is to make sure the email contains a clear call to action. The recipient should be able to tell right away what you’re asking them to do, and when they click through, they should be taken to the exact page they need, not just your homepage. If you ask them to click on a video thumbnail to watch a video, you need to link them directly to the video. If you’re asking them to read your latest blog post, link them right to it.

Hey Jonathan , enjoyed the article but it’s far fetched for startups and beginners like me who came here to see how in the first place we bring people to our website and not how we engage them or get email out of people who are already there.. getting people on your website is a bigger challenge, love your knowledge about the field is there an article which will help solve this?