You work with a list provider to find and purchase a list of names and email addresses based on demographic and/or psychographic information. For example, you might purchase a list of 50,000 names and email addresses of people who live in Minnesota and don't have children. There are several sustainable ways to use email marketing to grow your business. This isn't one of them.

An omni-channel approach not only benefits consumers but also benefits business bottom line: Research suggests that customers spend more than double when purchasing through an omni-channel retailer as opposed to a single-channel retailer, and are often more loyal. This could be due to the ease of purchase and the wider availability of products.[24]
Advertisers may also deliver ads based on a user's suspected geography through geotargeting. A user's IP address communicates some geographic information (at minimum, the user's country or general region). The geographic information from an IP can be supplemented and refined with other proxies or information to narrow the range of possible locations.[28] For example, with mobile devices, advertisers can sometimes use a phone's GPS receiver or the location of nearby mobile towers.[29] Cookies and other persistent data on a user's machine may provide help narrowing a user's location further.[28]
A text ad displays text-based hyperlinks. Text-based ads may display separately from a web page's primary content, or they can be embedded by hyperlinking individual words or phrases to advertiser's websites. Text ads may also be delivered through email marketing or text message marketing. Text-based ads often render faster than graphical ads and can be harder for ad-blocking software to block.[50]

After all is said and done, you’ll be left with a handful of people that have come in and transacted business with you based purely on your piece of mail. You can track this in any number of ways (coupon codes, requiring them to bring the mail in, comparing sales numbers from highlighted items on sale versus when they’re not, etc.), but be sure to track it in an easily manageable fashion. This will allow you to re-engage with those customers with whom your mail marketing was successful.
Did you know there are organizations dedicated to combating email spam? Thank goodness, right? They set up a little thing called a honeypot, which is a planted email address that, when harvested and emailed, identifies the sender as a spammer. Similarly, things called spam traps can be created to identify spammy activity; they're set up when an email address yields a hard bounce because it's old or no longer valid, but still receives consistent traffic. Fishy, eh?

What's the difference between them? One-off communications versus prolonged, email-based interactions. For example, email marketing tools are excellent for one-off communications. You can use these tools for the one time you'd like to send someone an automated email response when they join a subscriber list, on their birthday, or when you promote a new product. But marketing automation tools are better suited for prolonged, email-based interactions. For example, you can use marketing automation tools whenever you want to guide someone from a subscriber list to a product purchase. Or you can send thank you emails or send new product promotions—all without having to lift a finger after the workflow is designed.
When planning a direct mail campaign, don’t forget that you still need to follow the basic direct mail rules. A good list, a good design and a strong call-to-action are a must in order for your direct mail to be a success. Provide information on how people can use the technology you are including and strong content for them to view. If the content is not well designed, then your effort will have been a waste of time.
These metrics give you a high-level overview of how your subscribers are interacting with your campaigns and allow you to compare the success of one campaign to another. If you want to go deeper and see the exact people who opened and clicked your campaign, what links they clicked, etc. you can do so by choosing some of the other reports from the right hand side menu.
Frequency matters, and how often you send emails can have a significant impact on your revenue and email engagement (and unsubscribe) rates. Send too much and subscribers can suffer email fatigue causing them to disengage and unsubscribe. Send too few and you lose the attention of your audience. They may even forget why they signed up leading them to unsubscribe.
The books I've written have actually had three different titles, updated to move with the times. My first text book was titled: Internet Marketing: Strategy, Implementation and Practice. I then created E-business E-commerce Management and, with PR Smith, E-marketing Excellence, for professionals a couple of years later. Then, much later, the names switched and in 2012 we renamed the Internet Marketing book to Digital Marketing with the others becoming Digital Business and Digital Marketing Excellence.  About time too, since I was involved in developing the syllabus as an examiner for the first IDM Diploma in Digital Marketing back in 2004-5 when the term was hardly used at all - so it's been great to see 'Digital Marketing' adopted as the 'de facto' term, when I was first involved in defining it with the IDM students in 2004!
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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