A common example of permission marketing is a newsletter sent to an advertising firm's customers. Such newsletters inform customers of upcoming events or promotions, or new products.[11] In this type of advertising, a company that wants to send a newsletter to their customers may ask them at the point of purchase if they would like to receive the newsletter.
ConvertKit is specifically designed with creative people in mind, and that’s why we’ve chosen it as our email marketing software here at Copyblogger. Any member of our editorial team — no matter how technically challenged — can easily perform any task that needs to be done, including sending messages, creating automated sequences, using tags for message segmentation, reviewing analytics, and identifying personalization opportunities.
Coupon: Unlike the job application, you probably know very little about someone who has stumbled upon one of your online coupons. But if they find the coupon valuable enough, they may be willing to provide their name and email address in exchange for it. Although it's not a lot of information, it's enough for a business to know that someone has interest in their company.
If rounds of split testing, segmentation, and resends still result in low engagement scores for some of your subscribers then don’t be afraid to clean your list. Review subscriber data regularly to monitor activity and engagement ratings. Remove or further segment those who aren’t engaging in order to improve the overall open rates of your primary subscriber segments. https://www.websolutions.com/Customer-Content/www/CMS/files/blog/email-must-haves.png
Not only is InVision's newsletter a great mix of content, but I also love the nice balance between images and text, making it really easy to read and mobile-friendly -- which is especially important, because its newsletters are so long. (Below is just an excerpt, but you can read through the full email here.) We like the clever copy on the call-to-action (CTA) buttons, too. 

Cost per thousand (e.g. CPM Group, Advertising.com), also known as cost per mille (CPM), uses pricing models that charge advertisers for impressions — i.e. the number of times people view an advertisement. Display advertising is commonly sold on a CPM pricing model. The problem with CPM advertising is that advertisers are charged even if the target audience does not click on (or even view) the advertisement.