Project conversion metrics. The general rule of thumb is that the smaller and more targeted your list, the more you can spend per piece. It’s better to make a strong impression to a few than to make a weak impression to many. Know your cost per unit, and project a conversion rate, so you can estimate whether your campaign will have a positive ROI before running it.
Write great subject lines. David Ogilvy once said that 80 cents of your dollar should be spent on writing headlines. With emails, the subject line is just as important. If it doesn’t catch your attention, you won’t open it. So, spend the majority of your time writing and polishing your subject line. A great email subject line entices curiosity about the content of the email. It’s also personal, and highly relevant to the recipient. To learn more about how to write amazing subject lines, we have an entire blog post on the topic: 30 Successful Bloggers Share Their Best Converting Email Subject Line.
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".
A disadvantage of digital advertising is the large amount of competing goods and services that are also using the same digital marketing strategies. For example, when someone searches for a specific product from a specific company online, if a similar company uses targeted advertising online then they can appear on the customer's home page, allowing the customer to look at alternative options for a cheaper price or better quality of the same product or a quicker way of finding what they want online. https://irp-cdn.multiscreensite.com/9dbac298/dms3rep/multi/stock-vector-email-marketing-concept-vector-illustration-flat-style-254975962.jpg
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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