Besides the fact that email blasts can be spammy and impersonal, they’re also not the most effective way to make money. Although a large-scale email blast is sure to convert, it’s not because sending it was a strategic move — it’s because you cast a wide net. If you crafted a targeted newsletter instead, you’d see a better conversion rate and you’d be able to replicate the strategy many times over. Marissa Petteruti calls email blasts a wasted opportunity to generate more revenue, citing:
Much of this increase can be attributed to the ability to couple physical mail pieces with mobile and online marketing efforts, resulting in a sound multichannel marketing program. Think of how many pieces of mail you've seen recently sporting QR codes, URLs to social media sites, and SMS short codes. Mail affords marketers greater reach, allows more information to be communicated than most online advertising efforts, and gives buyers the opportunity to respond to a call to action in the way that they want, on their own time.
To build a maling list, marketers collect information about clients and potential customers through in-house research. Many stores offer a substantial percentage off a first purchase when consumers apply for a credit card in the store, or when they opt-in to an email list. Other organizations and companies might set up a booth at a fair or conference, offering a chance to win an iPad when customers sign up for their newsletters and mailings. https://1hdejnvtunmo3ckr2kr3m0y8-wpengine.netdna-ssl.com/wp-content/uploads/2018/01/14-Email-Marketing-Campaign-Ideas-1024x512.png
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
This ties into the second 40 of the 40/40/20 rule – now you’re probably beginning to see why that was listed up front and why it’s universally considered the gold standard when it comes to direct mail marketing guidelines. With other forms of advertisements or marketing, it is perfectly acceptable to only go after impressions – a billboard in a highly-trafficked area or a TV spot that is more of a teaser in nature can sometimes go a long way toward educating the public of your existence, which is the first step in getting them to engage. With direct mailings however, you might as well be printing cash to send out to people if you don’t have a compelling call to action to give people.
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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