The criteria and metrics can be classified according to its type and time span. Regarding the type, we can either evaluate these campaigns "Quantitatively" or "Qualitatively". Quantitative metrics may include "Sales Volume" and "Revenue Increase/Decrease". While qualitative metrics may include the enhanced "Brand awareness, image and health" as well as the "relationship with the customers".
"Constant Contact makes it easy to create as many contact lists as we need. I can add an email address to multiple lists at once, or a reader can subscribe to several email lists. This allows us to send targeted emails. Sending people only the emails they want makes readers happier, increases open rates, and makes my email marketing efforts—and my time—more effective."

For the design element, odds are that unless you have an artistic background, you’ll be either using a pre-existing template from your printer or having it designed by a graphics designer. The templates from your printer will more than likely have an effective eye flow and a solid ratio of graphics to text – if you go the designer route, be sure to get several mock ups and again seek the opinions of those around you whose opinion you value. And finally, print quality should be self-explanatory – be sure to go with a printer that offers some sort of guarantee on quality, or at the very least one that will offer you a refund or reprint if you’re not 100% satisfied. The last thing you’d want to do is have to settle on a poorly printed mailer to save costs.
Ad blocking, or ad filtering, means the ads do not appear to the user because the user uses technology to screen out ads. Many browsers block unsolicited pop-up ads by default.[87] Other software programs or browser add-ons may also block the loading of ads, or block elements on a page with behaviors characteristic of ads (e.g. HTML autoplay of both audio and video). Approximately 9% of all online page views come from browsers with ad-blocking software installed,[88] and some publishers have 40%+ of their visitors using ad-blockers.[3]
Next up is building an email newsletter. The best services offer several ways to do this; you can import your own HTML, start from scratch, or use a pre-designed template. Most of these services have drag-and-drop UIs that let you choose exactly the elements you want to include, as well as image libraries in which you can store assets such as your logo or company photos. Tools that let you test your emails for spam are also essential since there are some seemingly innocuous terms that may send up red flags and drop all of your hard work into your subscribers' junk folders or, worse, get your emails banned before they ever reach their recipients.
Market researchers usually have at least a bachelor’s degree in market research, statistics, sociology or other related field. Some researchers, particularly those with companies dedicated to market research and in larger corporations, have a master’s degree. Market researchers who take advantage of internships, either during or immediately after college, will also gain valuable hands-on experience they can use in the future.

Particular groups of customers can be targeted or even individuals. Offering individual customers special deals on merchandise and/or services on the customer's birthday, for instance, is one example of email marketing personalization. (A restaurant might send an email to customers on their birthday offering 50% off an entree,) Email marketing helps a business develop and maintain a relationship with a customer over time that hopefully results in increased sales and increased customer loyalty. 

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